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Best Portable Greenhouse 2018 – Buyer’s Guide And Reviews

Last Updated January 1, 2019
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Kyle DunnHi there, my name is Kyle Dunn and the first thing I would like to say is thanks for stopping by my website. Let’s discuss this topic to help you select best portable greenhouse for 2018 and take your experience to a whole new level with aerators.

I will go through the main features and what you should consider when deciding which one to pick over the other. I hope that my Top 3 list will provide you great options in buying the right fit for you.

Let’s get to it!

Best Cheap Portable Greenhouse Of 2018

Customers need to be careful on how they spend their money on these products. Now, let’s get to the gist of the matter: which are the best portable greenhouse for the money? Check them out and decide which one suits you the best to splurge upon. The “Total” indicates the overall value of the product.

Test Results and Ratings

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Total 4.8 4.5 4.3
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How to save up to 86%? Here is little trick.

You must visit the page of sales. Here is the link. If you don’t care about which brand is better, then you can choose the portable greenhouse by the price and buy from the one who will offer the greatest discount.



№1 – Abba Patio Mini Walk-In Greenhouse 12 Shelves Stands 3 Tiers Racks Portable Garden Green House – Best Small Portable Mini Greenhouse With Cool Design

Abba Patio Mini Walk-In Greenhouse 12 Shelves Stands 3 Tiers Racks Portable Garden Green House

Zipper door and walk-in design offers enough space for large size plants and easy access
Heavy duty transparent PVC cover for maximum solar performance
Featured with sturdy powder coated steel framework to against nature elements
Not found yet.

Why did this portable greenhouse win the first place?

I don’t know anything about other models from this brand, but I am fully satisfied with this product. The rear part fits perfectly! It is mounted really tight and reliable. I am very happy with the purchase. It is definitely worth its money. The product is top-notch! The product is very strong. Its material is stable and doesn’t crack.












№2 – Abba Patio Large Walk-In Greenhouse Fully Enclosed Portable Greenhouse – Cool Pop Up Portable Greenhouse For Cold Climates

Abba Patio Large Walk-In Greenhouse Fully Enclosed Portable Greenhouse

Heavy duty transparent PE cover for maximum solar performance
Featured with sturdy powder coated steel framework to against nature elements
2 zipper doors and ties allow easy access and great ventilation for plants and vegetables
Can be tedious to clean up.
A bit bulky.

Why did this portable greenhouse come in second place?

I recommend you to consider buying this model, it definitely worth its money. The material is pretty strong and easy to wash if needed. Managers explained me all the details about the product range, price, and delivery. This is a pretty decent product that perfectly fitted the interior of our office.












№3 – Abba Patio 4 Tier Mini Greenhouse Portable Lawn and Garden Green House – Best Portable Greenhouse Kits for DIY’ers Backyard/Indoor Usage

Abba Patio 4 Tier Mini Greenhouse Portable Lawn and Garden Green House

Protect your plants and herbs in all weather. Ideal for small places on a deck, balcony, backyards or lawn
Strong durable reinforced transparent PVC cover protect plants and allow sun to pass through
Constructed with heavy duty powder-coated steel frame resists chipping, peeling, rust and corrosion
No advanced features despite the cost.
The cover is not ideal.

Why did this portable greenhouse take third place?

This price is appropriate since the product is very well built. I liked the design. We’ve been using it for 2 months and it still looks like brand new. The material is incredibly nice to the touch. It has a great color, which will suit any wallpapers. It is inconvenient to use due to the size. I am going to get something different next time.












Winter Portable Greenhouse Buyer’s Guide

If you keep the before points in mind, you can easily go out to the market and buy portable greenhouse, right? No!

Frame Options

Greenhouse kits are made with several frame options. From the least expensive PVC hoop houses to the most expensive and durable Solexx composite frames.

Solexx composite frames combine PVC, steel and combination composite tubing — the same material that bridges are constructed of which offers durability and longevity through all manner of inclement weather. Solexx frames have higher R-value and lower U-values (insulating ability and measurable heat loss, respectively) than some other frame options on the market. But, like anything, quality demands higher costs. If you live in an unforgiving climate but want to garden year round, Solexx may be a nice option for you.


Aluminum is undoubtedly one of the most popular frames in greenhouse kits. It’s light weight, less-expensive than a composite frame but not as flimsy as a resin or PVC frame – and it literally shines. These kits are are fairly easy to assemble and the frame won’t rust or rot like steel or wood might in time. Check the strength rating before purchasing if your area sees heavy snowfalls. Aluminum frames can be anchored to the ground for windier regions, but if it’s too windy you might want to consider wood or Solexx. Do your homework and ask a professional what they recommend for your area.

Wood is another very popular material for greenhouse frames. A good tip is to use a high quality wood like cedar or redwood. Most wood being used outdoors these day is pressure-treated and comes ready to face the elements.

Resin is plastic and another go-to material for building a greenhouse. Some companies use recycled resin which is appealing to the Eco-friendly gardeners among us. If you decide to go with plastic, choose a light colored frame to detract the sun’s heat which can cause warping and degradation.

The least expensive and easiest to set up of them all: PVC greenhouses. Most PVC greenhouses are called hoop-houses as they resemble a series of hoops covered with a tightly pulled sheet of fabric that fastens into the base of the house. Hoop houses will help manage the climate inside for your plants and keep away insect invaders but in the case of strong winds and harsh winters, hoop houses aren’t the most durable. Double-check that the PVC is UV treated to prolong its life.


Glazing is just another word for the material-that-covers-your-greenhouse-frame. What kind of greenhouse glazing you choose really depends on where you live, your climate, altitude, sun availability and personal choice. The orientation of your greenhouse (north facing, east facing), what you want to grow, your budget and how you want the finished product to look, are all considerations you should make before purchasing a greenhouse kit.

Here are two things you should know about choosing a glazing before you buy.

Thermal insulation (R-value). The higher the R-value, the more energy efficient the glazing is. For example, double pane glass has an R-value that sits somewhere around 2, while single pane glass hovers around.9Therefore, we can accurately deduce that a double-pane glass is twice as energy efficient as a single-pane.

Light transmission %. The percentage of light that makes it through the barrier (glazing) without being reflected or absorbed is the light transmission percentage.

The higher the light transmission percentage, the more light your plant gets. The more light your plant gets, either the healthier it grows or the more it gets burnt. If you’re in a full sun area a lower light transmission percentage may be better for you (70-75%). With partial sun you want to be in the 90’s. The more diffusion of light that occurs the more evenly distributed the light will be inside the greenhouse.


Commonly used glazing materials include Solexx, glass, polycarbonate and polyethylene. Fiberglass and acrylic are far less popular now due to quicker degradation and less light transmission than polycarbonate.

Solexx offers opaque high insulation value with a low light transmission option for the hobby gardener. It costs a little extra but the diffusion of light is excellent with no hot spots.

Multi-wall polycarbonate is one of the most popular glazing options for greenhouse owners worldwide. Similar to double-pane glass, it is energy efficient and reduces the likelihood of hot-spots. Unlike glass however, polycarbonate can be struck with a hammer without breaking, lasts longer, and is more cost efficient with an equally high overall R-value.

Polycarbonate olycarbonate is a rigid plastic with a transparency akin to glass (light transmission of more than 92%). Plastic thickness can range from a 4mm twin-wall to a 16mm five-wall — depending on your needs and budget. It’s not as stylish as glass, but holds its own in function and cost.

Polyethylene Film

If you are on a shoestring budget poly film can give your plants some climate protection and keep some of the pests out. The downside is that it degrades quickly (within1-years) and offers little insulation from serious cold or heat.


Just as glazing and frame choice are important, it is crucial to ensure that your greenhouse has proper ventilation. You don’t want to cook your plants in the summer. One roof vent on either side of the roof ridge covering about 20% of the floor area is ample ventilation. Side vents are also useful but should not be used as roof vent replacements. It’s also necessary to make sure the plants don’t freeze in the winter by adding heat in colder climates.


Not everyone will need to pour a concrete foundation for their greenhouse. But people who live in colder climates may want to consider this add-on to keep heat in the greenhouse. Also, make sure that you choose an area where water doesn’t collect around your greenhouse.

Local Regulations

Unfortunately, in some cases there are those in authority that don’t want to see a bunch of little garden homes popping up all over the neighborhood. Associations like the HOA and local laws can interfere with where you want to put your greenhouse, how big it can be, how close it can be to your house or the street and so on. Check with your regional zoning office before sinking a bunch of money into something that may be in violation of local zoning laws, codes, or neighborhood restrictions. Failing to do so first has the potential to cause you problems after you have built and you don’t want that headache.

The following are some of our best greenhouse kit recommendations.

Large Backyard Greenhouse Kits

Large backyard greenhouse kits tend to be between 50 and 70 square feet in size. This kit is large enough for hobby gardeners and serious gardeners alike. You can grow an exciting variety of flora within these walls. All of the kits we reviewed are walk-in units with enough room to work and enjoy gardening without feeling cramped.

Gardman R684-Tier Mini Greenhouse

This kit can be readily assembled and your plants will thrive on a balcony, deck, or in a townhouse backyard. While diminutive in size, we found this unit a bit big for indoor use, but if you have the space, it could make a great addition to your indoor herb garden.

Greenhouses Protect Your Plants

There is nothing worse then putting loving attention into your plants only to have them ruined by a flash storm or burnt by the sun. By having a greenhouse you are giving your plants that little bit of extra protection to make sure continue to grow into the plants you desire.

This allows you to also have more lush flowers, veggies, and any other plants you might be trying to foster and protect. A greenhouse is a cheap and easy way to make sure your gardening project is taken care of with comfort and shelter.

The Walk In Greenhouse Attached To House

These are designed to look like half of a typical walk in greenhouse, but the main problem with the regular walk in greenhouse is that they take up too much space, and for those limited to the amount of room that they can allocate to their greenhouse a walk in greenhouse that is attached to your house is a great alternative.

Why Build a Wood Greenhouse

When looking to build your own greenhouse one of the most popular plan styles is wood greenhouse plans.

The reason for this is that if you want one that looks like a cheap greenhouse from Walmart then you will just go to Walmart and buy one from there. A wood greenhouse is something that has culture and is unique not something that can be bought, but instead needs to be built.

Not only that, but a lot of people prefer to own things that they have created themselves. Not only is it a keepsake as such, but it is something that they can look at each and every day and know that it is a direct result of their hard work.

Cheap Greenhouses

I get annoyed when people always try to tell me that everything is expensive. There are cheap greenhouse options available if you know where to look.

Use Second Hand Materials

With a lot of salvage yards popping up, this can be one of the best ways to save money making a cheap greenhouse. They will have more than enough second hand timber and metal available, at a heavily discounted price which will definitely lower the cost of your greenhouse.

Use Cloth Instead Of Glass

While a lot of people would love glass walls on their greenhouse, this is probably the major cost when you make a greenhouse. So consider using the regular green mesh cloth instead because this can turn an expensive greenhouse to a cheap one.

Ventilate the greenhouse and regulate the temperature

Thermal conditions are favorable for the growth of plants, particularly because the hot air remains inside. Must be regulated, however.

In summer, besides ventilation, it will install a shading system to prevent overheating: shade sails (above the tunnel) or shading screens.

For tunnels, the sheet is also a decisive factor: it must be heat, or even better, and thermal diffusion to best protect the plants by filtering the light rays.


There is a varying degree of quality when it comes to imported aluminium. Sproutwell™ use Aluminium Grade 606for all of our frames that is the main aluminium alloy that is used within the building industry.

The strength, design flexibility and corrosion resistance of this alloy is well in excess of the requirements of most major construction projects. By using this grade of aluminium, and our specially designed frame structures, our greenhouses offer longevity, high rigidity and stability and will maintain their new look for years. This is why Sproutwell can offer longer warranties over other greenhouse companies.


Purchasing a Greenhouse is a large investment and one you want to get right. We strongly suggest if you’re considering a cheaper Greenhouse or are confused about inclusions, quality, assembly, then we urge you to speak to the company before buying. Many Greenhouses sold on the Internet are ‘generic off the shelf’ designs and many of those companies don’t actually know or understand what they’re selling. Majority have never assembled a Greenhouse nor do they specialise or have a complete range of accessories to suit.

Single Burner Paraffin Greenhouse Heater

When you first see this product, there are two things that jump out; the compact size and the incredible design. Compared to the other options we’ve seen so far, this one is definitely for those with a smaller space and this is important to remember. If you have a larger greenhouse, the device may not have the power to generate the same heat throughout the space.

Offering a five-litre capacity, the heater should continue burning for 80 hours on just one fill. Thanks to the beautiful design from Fireside, we have brass-plated twin burners, threaded chimneys, and several other features that don’t seem possible on such a compact unit. If we look at the size for a moment, it’s around 300mm wide and 400mm high but it also has a sturdy nature which removes the worry of it tipping over or causing any similar issues.

Industrial Fan Heater

If power is the most important feature for your greenhouse heater, we have the answer here and it comes from Modern Life. For a 20 square metre room, they say it takes around five minutes for the heater to have the whole room warm. However, this isn’t the limit for this heater because the manufacturers claim anything up to 60 square metres to be possible.

Compared to other models we’ve seen here today, the difference with this one is the sheer number of features you receive. Of course, we should probably start with the 3kW power since this is something you won’t find on too many models. This being said, you can control the power if you only have a smaller room since there are options of 30W, 1500W, and 3000W. After this, we like the overheat safety cut-off feature, the heat-resistant handle, adjustable thermostat, stainless-steel heating element, noiseless fan, oxide layer protection, fixed safety bracket, and even the enclosed dust-proof motor.

All things considered, it feels like a heater designed by an experienced greenhouse keeper. With all the features we’ve mentioned, they don’t make or break the experience but they make it easier and more enjoyable. For example, the dust-proof motor will extend the life of the heater while the noiseless fan actually prevents us from getting frustrated more than anything else.

LightHouse Eco Heat Greenhouse Heater

From the most powerful model in our list to the most economical, we have the LightHouse Eco Heater and it’s yet another that has a good reputation within its niche. As you would expect, this heater allows you to create a stable environment for plants regardless of what’s happening outside. Even during the coldest days in winter, the temperature can remain stable and your plants and perhaps even vegetables can grow naturally.

Away from the basics, the power is less than you might find elsewhere. With three settings of 45W, 80W, and 135W, you can choose the model that best suits your needs but even the most powerful doesn’t compare with what we’ve already seen. This being said, less than 50w per foot of energy is used when in operation which brings the unit on a par with an ordinary lightbulb. In fact, LightHouse believe it to use 25% less energy than the majority of other tube heaters on the market. If your main interest is on saving money and you only have a small area to heat anyway, this makes for a superb investment.

Due to the size and efficiency, most buyers end up finding more uses for this nifty device such as drying out damp cupboards and even as a simple heater within the home when the greenhouse doesn’t need the help.

Hoophouses are a great alternative to greenhouses as they provide almost all of benefits of them at a much lower cost. They are also easy to build and versatile in operation. There’s nothing fancy in them like some greenhouses. Therefore you can buy or build a small polytunnel, below hundred dollars easily unless you decide to make things the other way.

Hoophouse is, as the name suggests, a structure made with series of vertical hoops connected with horizontal cross beams. If you are not used to these structures, they may appear flimsy and fragile at the first sight. However, the reality is quite the opposite as the tension in the loops and stability given by horizontal connections can really make them very strong.

Lot of the gardeners who make their own small polytunnels use plastic pipes as they are the cheapest. But stronger durable structures can be built with metal, wood or reinforced plastic at a higher cost. A polytunnel can be covered with variety of materials including, greenhouse plastic, nets, raw sheets, etc. depending upon the various parameters like season and crop. The cover is fastened in to the soil or any other solid support like a baseboard through strips of wood, clips or staples.

Building a hoop house with hoop house kits

Interestingly, hoop house kits are becoming very popular among gardeners these days. The major advantage of these polytunnel kits are that, you can set them up in minutes. On the other hand small polytunnel that is enough to cover several average raised beds, is not going to be significantly expensive than building one by yourself. This is even not considering the time and effort you need to put in for a DIY option.

The other great thing about hoop greenhouse kits are that they usually have metal frames. Therefore they are going to last more and will be much stronger compared to PVC pipe option that most of the gardeners use to build their own hoop houses.

Most of the polytunnel kits come with modular designs. This make it easier to build and take them apart when necessary. So you can build them over your raised beds during the spring, fall and winter seasons and easily take them apart for summer.

Hoop houses make it easy to change the covering material. Some small polytunnel kits provide multiple covering materials such as poly films, fleece and nets for year round use.

Ideal for displaying greenery in full sun

This price is appropriate since the product is very well built. I liked the design. We’ve been using it for months and it still looks like brand new. The material is incredibly nice to the touch. It has a great color, which will suit any wallpapers. It is inconvenient to use due to the size. I am going to get something different next time.


Buying a new house is very stressful, as is buying a new car and other expensive items, but over the years we do gain some experience with these major life purchases.

We deposit these experiences in own knowledge bank, ready to withdraw when we buy again. But this is not always the case with buying a greenhouse as many of us may only buy one in a lifetime, therefore we have no experience of a similar purchase.

Buying a greenhouse can be a fairly major purchase financially but also a major purchase in time. Greenhouses need a keeper, what you put in is directly proportional to what you take it, but you have to commit first, and try second. Getting it wrong can hurt.


Solar energy or wind turbines may become a consideration in the future but at the moment they are far too expensive due in part to the poor heat retention qualities of a greenhouse. Spent cooking oil is used occasionally commercially but is messy, smelly and not really suited to small scale production.

Halls Greenhouses

Halls Greenhouses are possibly the most well-known brand in the UK. They have been available in garden centres, DIY stores and multiple outlets in various guises for many years. When they joined forces with AGL (Aluminium Greenhouses Ltd.) they consolidated their position in the market, particularly in the 6ft wide greenhouse sector. The 8ft x 6ft aluminium model became the optimum size for the burgeoning UK market. They named it the Popular Greenhouse for good reason, as well as a cursory nod to Henry Ford and his production techniques from many years ago. The Halls Popular range expanded to accommodate the 6ft x 6ft version and the 4ft x 6ft version. This baby of the range would prove to be a massive seller and is still so today. The 10ft x 6ft version was the last to be introduced, representing the best value for money in my opinion. I have no hesitation in recommending any of this range.

The Supreme range is based on the Popular sizes but features a curved acrylic window at the eaves. There is no gutter on this model, it is all about style. Halls also sell the 8ft wide range marketed under the Magnum banner. Featuring double doors, extra height, strengthened joints as well as the extra width these offer massive potential at real value for money prices. Halls greenhouses offer lean-to models, mini greenhouses, cold frames and a wide range of spares and accessories. Delivery to UK and Ireland is available as well as a national dealer network to offer the type of service and backup you would expect from such a well known name. Installation is also available from Halls on new purchases in mainland UK.

Swallow GB Greenhouses

Swallow GB Greenhouses have not been manufacturing for very many years but have already made quite an impact on the UK greenhouse market with their use of ThermoWood, Scandinavian timber that has most of its moisture and resing extracted by heat treatment. This means that the resultant wood does not need treating annually with preservative, as it is highly durable, weather resistant, and will not warp or crack.

Market leading specifications include at least one vent as standard sealed with machined timber capping, toughened glass fitted into a groove with silicone sealing, staging along one side, lockable door, a 20mm damp course along the base and, perhaps most importantly, delivery and installation is included in the price.

The frame can have an opaque acrylic top coat in a standard colour or one of your choice which is bacteria, mould and UV resistant, and there is a long list of accessories including rainwater collection systems and extra staging and shelving.


Greenhouses can be traced as far back as 35AD when roman Emperor Tiberius had a glass house constructed specifically for growing supposedly medicinal cucumbers. Over the centuries these glass structures continued to develop and by the 16th century enormous orangeries and pineries were protecting orange and pineapple trees in winter, whilst also advertising and confirming the wealth and status of their owners.

In Victorian times glass became cheaper and more readily available. This resulted in greenhouses became popular as a means of housing exotic unusual plants such as orchids and palms.  The best example perhaps being the magnificent Palm House at Kew Gardens. With 16,000 panes of glass and an immense central dome Kew’s Palm House is considered to be the world’s best example of a Victorian iron and glass construction.

By the middle of the 20th century the first mass produced greenhouses became available made not only in traditional wood but also galvanised metal and aluminium. And today greenhouses are a relatively common site and come in a wide range of shapes, sizes, materials and colours.

Your greenhouse will need to be in an open sunny position but sheltered from any strong winds and preferably not to close to any trees. If you want to be able to heat the greenhouse then ensure it is close to an electricity supply.

Size and Shape

The size will be determined by the available space and budget but do opt for the largest you can as you’ll always be able to fill it! Greenhouses are now available in all sorts of shapes including domes although the traditional rectangle is still the most popular and with its high roof allows for good light transmission.


The choice of material for the frame depends on both personal taste and budget. Wood is the traditional choice and arguably the most attractive but is expensive and needs regular maintenance. Aluminium frames are cheaper, require no maintenance and can be colour coated.

For glazing glass is definitely the best option with toughened glass on the door as a minimum. Other glazing materials may be cheaper but they will not let in as much light as glass and will degrade through time. being the most simple and the most effective.

DIY Home Improvements

It’s unlikely that there is a gardener alive who wouldn’t want to own their own greenhouse. Such an idea appeals most to those who live in colder climates. A greenhouse makes it possible to grow an unlimited number of seedlings, and it doesn’t even matter where you happen to live. A greenhouse can be turned into a tropical environment, which can serve as a home for jasmine, citrus and orchids.

Choosing a Greenhouse

You need to decide if you want a custom greenhouse or a kit. Since many different companies offer to build greenhouses at an affordable price, it almost doesn’t make financial sense to do it yourself. However, if you’re building a new home and want to integrate a greenhouse, then you might want to consider doing it yourself. A greenhouse kit can be very elaborate, or it can be nothing more than a polyethylene box with hardware.

Modern or Classic

It’s important to make sure the style of the greenhouse matches your home. A classic style is suitable for certain types of homes, but it can be difficult to shovel snow off of the roof and could present several other issues. A modern style is easier to manage and doesn’t come with the same problems. The overall size is nearly as important as the style.

Choosing the Material for the Greenhouse

Another consideration to make is whether you want plastic or glass. For most greenhouse glazing applications, glass is still the preferred choice. However, gardeners now have plenty of new, high-quality horticultural plastics that they can choose from. Some of these new horticultural plastics are tedlar, polyethylene, acrylic and polycarbonate. When deciding on a glazing material, the lifespan and appearance of the material are important. You also need to choose between double or single-glazed options. Multi-pane greenhouses are notorious for being hard to seal. Plastic glazing still offers some unique advantages over glass, such as being more suitable for temperature fluctuations.

High tunnel

The third type of greenhouse is a low-tunnel. They are similar to high-tunnels in that they only use passive ventilation, but they are much lower to the ground. Low-tunnels are only appropriate for certain types of plants, and they are more economical than high-tunnels.

There are four main greenhouse shapes

Greenhouse wire frames can be made from many types of durable materials, each with their own advantages and disadvantages. The important thigns to consider are weight, durability, and price.


Here are great space-saving ideas for mini indoor gardens that get two green thumbs way up. They are gardening projects that will work on even the smallest patio or balcony.plus tips for growing citrus indoors if you dont have a balcony at all.

Pests And Diseases In The Greenhouse that require special care. And while a hight degree of environmental control offers a tremendous amount of latitude, it also means taking on some new responsibilities.


Heaters, vents, and fans are your allies in temperature control. Even in a well-designed solar-efficient greenhouse, outside conditions are sometimes so cold and cloudy that auxiliary heat is needed to keep plants growing at an optimum rate.

Adjust air temperature in the greenhouse according to the level of light. In general, summer crops grow best at temperatures of about to 8degrees in the daytime and 60 to 7at night. On cloudy days, these temperature ranges should be somewhat lower, since the plant is not manufacturing as many sugars as usual.

Ornamentals typically need night temperatures no lower than 5degrees, and tender tropicals can require night temperatures of 60 or even higher.

Air Circulation

Plants use carbon dioxide from the air to manufacture sugars. In a closed greenhouse, carbon dioxide can be so depleted that plant growth is slowed. Remember to ventilate to change the air supply at least once each morning, even if you have to add extra heat.

Things to consider

The closer to the house or garden your greenhouse is located, the more you are likely to use it. Location is a key factor in creating the ideal growing environment and helping to ease heating costs. Locate your greenhouse so that it receives a minimum of six hours of sunlight per day is during winter months. Anything less and you may have to supplement with grow lights. If possible, align the longest side of your greenhouse to face south. This allows the roof to attract the most amount of sunlight during the day.

How do I heat my greenhouse? While the sun will heat up the greenhouse during the day, an uninsulated greenhouse will cool off quickly at night. In a moderate climate, the best choice for keeping a small greenhouse above freezing is a small electric heater. For larger greenhouses a propane or Natural gas heater is a more economical solution. There is a formula that will calculate the heating requirements for your greenhouse. The capacity needed is dictated by the square footage of the greenhouse and the glazing components used. For Orchid Growers – backup generators are common or gas heating in the event of power outages. Portable camping heaters are also used in the event of power outages.

All Rogers’s structures offer the ability to double glaze using one of two systems which help to insulate the greenhouse and reduce heating costs. See glazing systems Contact one of our greenhouse experts today to talk about your heating needs.   Ventilation   The size of greenhouse will determine the amount of ventilation required. Rogers smaller hobby greenhouses have heat activated roof vents to provide proper air circulation. Overheating is the principal cause of plant failure in a greenhouse. A greenhouse must retain warm air during the cooler months, but also needs to release hot air during the warm months. There should be sufficient allowance for air to enter and exit the structure. Rogers Hobby greenhouse kits come with heat activated roof vents. This allows you be away from the garden during the hottest parts of the day without having to worry about your plants being overheated. An oscillating fan installed in the greenhouse creates air movement protecting plants from heat exhaustion.

FS- 9’ x 17’

For larger greenhouses or hotter climates, a forced ventilation system may be necessary to ensure the greenhouse does not over heat. This will usually include a combination of exhaust fan, motorized intake shutters and thermostat, providing a more controlled environment. Rogers’s larger greenhouse offer continuous automatic or manual roof vents with Thermostat control.

Shading the Greenhouse

All Rogers’s greenhouses come with an energy and shade curtains. Energy and shade curtains are an integral part of greenhouse growing, blocking out 65% of the sun’s harmful rays, minimizing heat build-up in the warmer months and retaining 62% energy in the winter helping to reduce your operating cost.

When your plants overgrow your windowsill, the next step is usually a greenhouse. If you lack the space for a full-blown greenhouse, then a mini greenhouse becomes an attractive option. Mini greenhouses are ideal for planting a wide range of vegetables, including peppers, tomatoes and aubergines.

With a wide selection to choose from, picking one greenhouse over the other could be stressful. We have prepared this list of the top mini greenhouses in 2018, in the hopes that it will help you to make a better purchase decision.

Gardman R694-Tier Steel Frame Greenhouse

For people with a greenhouse, shed or garage space, who just need a shelf, this 4-tier Gardman R69is the perfect solution. It provides shelf space for your plants, but does not provide any cover. This makes it unsuitable for outdoor use, although its steel frame features a green powder-coat finish. On the other hand, it is quite sturdy and measures 3(L) x 1(W) x 4(H) inches.

Pros: 4-tier, made from the durable tubular frame, 31% discount.

Quictent 3-Tier Walk-In Mini Greenhouse

This greenhouse from Quictent features shelf levels on each side. Designed with heavy-duty and powder coated steel, each shelf can withstand up to 1lbs. of weight each. The shelves are also flexible, and can be easily removed to create more space for a plant. It comes with its own clear PVC cover, which has a zippered roll-up door. The cover is 100% waterproof, offers UV protection, and will keep dust and insects away from your plants. The complete construction measures 5(L) x 2(W) x 7(H) inches.

Pros: Very sturdy construction, 1lbs. max weight per shelf, ISO 9001:2000 certified.

Abba Patio Walk-In Mini Greenhouse with Large Door

Abba Patio is a top designer of gardening products, and this is easily seen from this greenhouse. The black and white combination makes it a sight to behold. It features windows for ventilation, on each side, and all covered with netting to protect against insects. There is a large 2-zipper door, for ventilation and easy access to the plants. The cover material is a transparent Polyethylene, and the entire greenhouse measures (L) x (W) x 7.(H) inches.

Pros: Heavy-duty powder coated steel frame, roll-up windows with netting, zippered doors.

Foundations and Floors

Some of the greenhouses either come with or have a base available to build them on. The others can be built on treated lumber bases, but it is best to use a more permanent foundation, similar to those in residential houses, such as a poured concrete, brick, or block. The base is only referring to the perimeter of the greenhouse.

Permanent flooring is not recommended because it may stay wet and slippery from soil mix media. A concrete, gravel, or stone walkway 2to 3inches wide can be built for easy access to the plants. The rest of the floor should be covered by several inches of gravel for drainage of excess water. Water can also be sprayed on the gravel to produce humidity in the greenhouse. If a permanent floor is desired it should be provided with good drainage and an anti-slip surface.


The heating requirements of a greenhouse depend on the desired temperature for plants grown and the location and construction of a greenhouse and the total outside exposed area of the structure. As much as 2percent of the daily heat requirement may come from the sun, but a lightly insulated greenhouse structure will need a great deal of heat on a cold winter night. The heating system must be adequate to maintain the desired day or night temperature.

Solar-heated greenhouses were popular briefly during the energy crisis, but did not prove to be economical to use. Separate solar collection and storage systems are large and require much space. However, greenhouse owners can experiment with heat-collecting methods to reduce fossil-fuel consumption. One method is to paint containers black to attract heat and fill them with water to retain it. However, because the greenhouse air temperature must be kept at plant growing temperatures, the greenhouse itself is not a good solar heat collector.

Calculating Heating System

1.      A is the total exposed (outside) area of a greenhouse sides ends, and roof are one unit; on a curved eave, the sides and roof are one unit; measure the length of curved support beam and multiply by the length of the house, on a free standing curve multiply by two. The curve ends area is (ends) X 2/X width. Add the sum of the first calculation with that of the second.

2.      U is the heat loss factor that quantifies the rate at which heat energy flows out of the greenhouse. For example, a single cover of glass has a value of 1.Btu/h x (ft x ft) x degree F (heat loss in Btu’s per hour per each square foot of area per degree in Fahrenheit). The values allow for some air infiltration but are based on the assumption that the greenhouse is fairly airtight.

This discussion is a bit technical, but these factors must be considered when choosing a greenhouse. Note the effect of each value on the outcome. When different materials are used in the construction to the walls or roof, heat loss must be calculated for each. For electrical heating convert Btu/h to kilowatts by dividing Btu/h by 3,41When using wood, gas, or oil in the greenhouse a fresh air inlet is recommended. Unvented heaters are not recommended.

Air Circulation & Ventilation

Installing circulating fans in your greenhouse is a good investment. During the winter when the greenhouse is heated, you need to maintain air circulation so that temperatures remain uniform throughout the greenhouse. Without air mixing fans, the warm air rises to the top and the cool air settles around the plants on the floor.

Small fans with a cubic foot per minute air moving capacity equal to one quarter of the air volume of the greenhouse are sufficient. For small greenhouses, (less than 60 feet long) place the fans in diagonally opposite corners, but out from the sides and ends. The goal is to develop a circular (oval) pattern of air movement. Turn the fans off during the summer when the greenhouse will need to be ventilated.

The fan in a forced air heating system can sometimes be used to provide continuous air circulation. The fan must be wired to an on/off switch so it can run continuously, separate from the thermostatically controlled burner.


Ventilation is important; even in cold weather a greenhouse can get too warm on bright, sunny days. Ventilation is the exchange of inside air for outside air to control temperature, remove moisture, or replenish carbon dioxide. Several ventilation systems can be used. Be careful when mixing parts of two systems.

Natural ventilation uses roof vents on the ridgeline with side inlet vents (louvers). Warm air rises on convection currents to escape through the top, drawing cool air in through the sides. Mechanical ventilation uses an exhaust fan to move air out one end of the greenhouse while outside air enters the other end through motorized inlet louvers. Exhaust fans should be sized to exchange the total volume of air in the greenhouse each minute.

The total volume of air in a medium to large greenhouse can be estimated by multiplying the floor area times (the average height of a greenhouse). A small greenhouse (less than 5000 cubic feet in air volume) should have an exhaust fan capacity estimated by multiplying the floor area by 12.

The capacity of the exhaust fan should be selected at one-eighth of an inch static water pressure. The static pressure rating accounts for air resistance through the louvers, fans, and greenhouse and is usually shown in the fan selection chart.

Ventilation requirements vary with the weather and season. One must decide how much the greenhouse will be used. In the summer, to 1.air volume changes per minute are needed. Small greenhouses need a larger amount. In the winter, 20-30 percent of one air volume exchange per minute is sufficient for mixing in cool air without chilling the plants.

One single speed fan cannot meet this criterion so two speed fans are better. A combination of a single speed fan and a two speed fan allows three ventilation rates that best satisfy year round needs. A single stage and two-stage thermostat are needed to control the operation.

A two-speed motor on low speed delivers about 70 percent of its full capacity. If two fans have the same capacity rating then the low speed fan delivers about 3percent of the combined total. This rate ventilation is reasonable for the winter. In the spring, the fan operates on high speed. In the summer, both fans operate on high speed.

Some greenhouses are sold with a manual vent or ridge vent. The manual system can be a backup system, but it does not take the place of a motorized louver. Do not take short cuts in developing an automatic control system.

Shade Cloth

Shade Cloth is one of the most important elements in keeping a greenhouse cool in the summer. It may be installed inside hung from wires or on the outside either fastened on grommets on the edge of cloth with ropes or using a roll up and down system. It comes in 30 – 90 percent light transmission. It is the most effective in heat reduction when installed on the outside but it can also interfere with the vents. There are also blinds that can be installed but they also have the same problem of interfering with the vents as with shade cloth on the outside. The blinds on the inside can be adjustable. Used with a properly designed ventilation system temperature inside the greenhouse should be within to degrees of the outside temperature.

Misting Systems

There are many misting systems available that can be used for cooling and or raising the relative humidity in the greenhouse. Relative humidity (RH) is a measure of how much water is dissolved in the air at a particular temperature expressed as a percentage. Generally, growth of many plants is relatively unaffected by RH between 4percent and 8percent. Plants growing at RH below 4percent may grow slowly, have smaller leaves, require water more frequently, or develop burned leaf margins or leaf tips. Plants growing at RH above 8percent are susceptible to fungal pathogens, especially if water condenses on the foliage.

Several conditions can occur in a greenhouse due to problems caused by high or low RH. During the summer, high light, high temperature and rapid air movement from fans can reduce RH to unacceptable levels. Shading to reduce light and temperature and using misters or evaporative cooling are the best the best solutions. It is also advisable to keep the greenhouse full of plants because plants generate a lot of RH.

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Greenhouses come in different sizes, from simple cold frames to full-size glass structures. Depending on the actual make and model you purchase, your greenhouse may include electricity, heat, benches, shelves and lighting.

Each amenity gives you more ways to make use of your greenhouse. For example, having lighting means you can visit your greenhouse after dark and work on cuttings, planting seeds, and performing other gardening tasks. Having a heating system, in addition to solar heat, means you can grow almost anything year-round. Think about all the things you want to do with your greenhouse, and that will help you choose a model that suits your needs.

Heating and Ventilation

The ideal temperature inside the greenhouse is about 80 to 8degrees Fahrenheit, so the first and most important lesson is learning how to keep the internal temperature steady. Greenhouses mainly harness the sun’s rays to heat the interior air, although some may also have supplemental heat sources powered by gas or electric heaters. Just like a car, the building’s interior can quickly heat up to over 100 degrees Fahrenheit on a warm, sunny day, so you need to regulate the temperature or you risk stressing and perhaps even killing your plants.

All greenhouses must include vents, either a top vent that opens a hatch in the ceiling or side vents and fans that whisk out hot air and usher in cooler air. You can choose to use vents that operate manually or automatically. Manual systems are cheaper, but you must remember to open and shut the vents or prop open the door during the day and close it at night. Some people consider this a hassle, and for those who aren’t home during the day, it is a problem if the weather changes suddenly. Automatic ventilation systems work on a sensor that kicks on the fans or heating if the temperature rises or falls below thresholds that you program into the system; it’s similar to how your home heating and cooling system works.

Using Shade Cloth

Shade cloth comes in rolls of green or other dark-colored material that rolls down like a window shade over the outside of the greenhouse windows. You can roll it up or down to adjust the temperature and light levels inside the greenhouse. During hot summer months, a shade cloth can help you cool the temperature as well as well as create a more moderate light level inside the greenhouse. During winter, you can roll up the shade cloth to increase the amount of light that enters the greenhouse.

Glass vs POLY Vs Film

There is a range of different glazing options for greenhouses and to be honest they all have advantages and disadvantages when compared. The right glazing for your greenhouse will be determined by your requirements, personal preferences, climate and budget.

What to look out for

You can choose different thicknesses of polyethylene skin, we recommend 200-micron as a minimum in New Zealand, any less and you’ll end up replacing it even sooner.

Traditional Classic Glass

Glass has been the preferred traditional glazing because of its permanence and beauty. However, glass is one of the least efficient materials for retaining heat due to its high heat transfer rate (i.e. allowing the cold temperature to transfer though the glass very easily) and poor insulating characteristics.

Greenhouse manufacturers offer a range of glass grades but we recommend you avoid the 3mm float glass as it is extremely dangerous due to its brittle, fragile and unforgiving nature.

If you’ve made up your mind that glass is your preferred glazing then we recommend you opt for a 4mm toughened safety glass. Although it’s more costly it does provide slightly better thermal efficiency than the 3mm float glass, and will more than likely last a lot longer due to its strength and durability, while still providing you the traditional clear glass look that you want.

Fragile and less forgiving to knocks

The flutes in the twin-wall can attract moisture, mould and bugs – if not sealed sufficiently in the frame.

Takes the knocks

The ‘R’ Value is the common unit of measure for the effectiveness of thermal insulation. The larger the number, the higher the insulation value and therefore the better heat retention.

Spectral transmittance of selected rigid greenhouse covering materials.

Spectral transmittance of selected film greenhouse covering materials.

Glazing Products to Avoid

Acrylic plastics, such as Perspex. This does not last when exposed to UV, and usually shows signs of deterioration within 2-years.

Winter Gardenz is a family owned business established in 2007,  manufacturing and operating in New Zealand, Australia and USA.


The polycarbonate sides of this greenhouse are durable and fade resistant.

Jerrel Miller (VP of Operations) and his wife Karen have sat down and designed a small greenhouse that is as friendly to the environment as it is friendly to use.

The perks of growing in a greenhouse

Some of the disadvantages that come with growing outdoors can be truly awful. For example, pests can be particularly harmful to your marijuana crop, and they come in a broad range.

Anything from deer to rabbits to mites to mold can affect your marijuana plants when they are growing outdoors. Marijuana plants growing in a greenhouse, however, will only encounter insects — and that makes prevention that much easier to begin with.

Greenhouses can even be stealthier than other types of outdoor grow setups, allowing for your marijuana plants to be hiding in plain sight. This is especially true when you are living in a residential area since a greenhouse for things such as herbs and vegetables is already a perfectlynormal and reasonable thing to do. You can simply intermix a few marijuana plants with said herbs and vegetables, and you have formed the perfect hiding spot for your marijuana plants.

This is even easier if you are living somewhere rural instead, as you can put more marijuana plants into your greenhouse. Of course, not everything is perfect when it comes to growing marijuana plants inside of a greenhouse. The smell can be overpowering when you increase the number of plants, and carbon filters can’t be used in greenhouse setups. If you happen to have a greenhouse with a really intense smell, be sure to try and take out the smell with an in-line ozone generator.

When you grow marijuana inside of a greenhouse, you get to control every aspect of the grow environment. In other words, you can maximize the nutrients and other elements to ensure that your plants are getting the best and healthiest care they can.

Poly tunnel greenhouses

You can usually find poly tunnel greenhouses in commercial operations, but that does not mean they are scaled down and sold to private marijuana growers as well. Their frame is curved, unlike the standard free-standing greenhouses, and their frames are generally made of aluminum. The exterior is made from polythene sheeting. Although these actually cost less than a conventional greenhouse, the sheeting part will have to be replaced fairly often.

An additional aspect of buying greenhouses that you have to consider is how big of a greenhouse you would like to buy. As a good rule of thumb, always purchase greenhouses that are one size larger than you initially think you need, as it almost always happens that the grower ends up using more space than they expected. Not only that, but a greenhouse that is too big is not a problem, as the extra space can simply be used for storing supplies and what not. A greenhouse that is too small, however, can cause some issues in your growing operations.

Maintaining temperature in a greenhouse

One of the trickiest aspects of growing marijuana in a greenhouse is the fact that the temperature is so difficult to keep at a healthy level. In general, you will struggle more with overheating than with keeping things warm enough for your marijuana plants’ survival.

Although warm air is certainly necessary for any marijuana grow setup, this is only critical during the cooler months out of the year. During the warmer months, however, the hot air inside of your greenhouses needs somewhere to go, or else it will cause the temperature to rise to levels that are dangerous for your marijuana plants.

The best way to combat this temperature difficulty, then, is to have proper ventilation. This can be done most effectively by simply purchasing a greenhouse that already has a good ventilation setup or the possibility of installing one without too much trouble.

Ventilation should be found in the glazing of the greenhouse and should total at least 20% of the total floor area. Mainly it needs to be good enough that air can go in and out of the greenhouse without too much trouble — the best positioning for vents to achieve this is to have vents at the top of your greenhouse (to release hot air) and at the bottom of it (to take in cool air).

Growing your plants

Before growing, you will need to choose a strain. Keep in mind that, assuming you are living in a Northern Hemisphere location with four seasons out of the year, your marijuana plants will probably be able to grow between the months of April and November. This also means that October is the harvest month. You can expect to grow one full crop (from germination through the harvest) each summer season.

Make sure you are sowing your seeds by April, as that will allow you to bring your marijuana plants out into your outdoor grow setup (in the greenhouse) by the middle of May or the start of June, giving them plenty of time to grow during the summer growing season.

You can expect the vegetation period of your plants to occur throughout May and June, and once the sunlight hours reach their peak and then begin to decrease again in the middle of summer then the flowering period will be naturally triggered to begin. At this point, you have between two and three months to get your marijuana plants to grow their buds as much as possible, meaning you can harvest them sometime in September, October, or November.

Some people prefer to grow their greenhouse marijuana plants with a hydroponics system. If this sounds like something you are interested in, you should consider a passive hydroponic system that is not powered by a power source (pumps, timers, and electricity). These passive systems do exist and will achieve equally high yields as “regular” hydroponics systems.

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Final Word

First of all thanks for reading my article to the end! I hope you find my reviews listed here useful and that it allows you to make a proper comparison of what is best to fit your needs and budget. Don’t be afraid to try more than one product if your first pick doesn’t do the trick.

Most important, have fun and choose your portable greenhouse wisely! Good luck!

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