The 8 Best Greenhouses to Buy in 2018

Garden year-round with these smart sheds

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If you have a green thumb, or just want to try your hand at horticulture, a greenhouse can be a great choice for protecting plants during chilly weather, starting new plants or raising high-humidity plants like cactus.

Gardeners love the ability of a greenhouse to trap heat and humidity, and it can help your vegetation to weather unseasonable temperatures or adjust to life outdoors after being raised from seeds in an indoor climate. There are greenhouses of all sizes — ranging from small pop-up...MORE units or simple shelving covered with greenhouse PVC to larger and more elaborate polycarbonate and aluminum or cedar structures.

When you choose the best greenhouse to buy, consider your gardening needs, whether you want a freestanding ‘shed-style’ greenhouse or a lean-to, and if features such as built-in gutters and self-opening vents are important to you. Once you purchase a greenhouse, you can look forward to enjoying a ‘greener’ getaway right in your own backyard! Here, the best greenhouses for you and your garden. 

  • Best Overall: Ohuhu Large Walk-in Plant Greenhouse

    If you are looking for a greenhouse that will keep your plants humid and happy through almost any type of weather, the Ohuhu Large Walk-in Plant Greenhouse is our top overall pick.

    This greenhouse offers plenty of space, but also has a small enough footprint that it won’t take over your entire backyard. The greenhouse measures a little over four feet long and four feet wide but offers over six feet of headroom inside — making it easy to tend to your plants without having to bend over or feel...MORE cramped. Inside, you’ll also have 12 shelves, with six on each side positioned in three rows.

    Our top pick for a greenhouse is also easy to put together. Most people agree that the design is relatively simple and can be completed in about an hour. A few users added additional tie-downs to stabilize the structure in the event of high winds. People comment on the fact that the greenhouse accomplishes its purpose of keeping plants in a warm, humid environment – even when outside temperatures begin to dip. If you’re looking for an easy-to-assemble greenhouse with plenty of space for your plants and room to move around inside, order the Ohuhu Large Walk-in Plant Greenhouse.

  • Best Budget: Flower House PlantHouse 3 Pop-Up Plant House

    This portable greenhouse is easily assembled in a matter of minutes and comes in a few different sizes depending on your needs. The PlantHouse 3 is 3.5" x  3" x  3" so it can easily be positioned over existing shrubs, or place your containers inside of the greenhouse to protect from cooler temperatures. Another nice feature that sets this budget greenhouse apart is the fact that its vents are screened — keeping your tender plants from becoming an easy snack for birds or insects.

    The...MORE PlantHouse is made of waterproof material and has several poles that add to the stability of the structure (similar to the construction of a pop-up tent). People love it for its ability to trap heat, and it also is useful in protecting vegetation from being eaten by deer and rabbits. For the price, this budget greenhouse is a great choice if you need to protect just a few plants or shrubs.

  • Best Mini: Gardman 4 Tier Mini Greenhouse

    At just 27" x 8" wide, this greenhouse has four shelves that are front and center after rolling up the zippered door. The greenhouse is just over feet tall and has a small footprint. It’s a great choice for placing anywhere that space is at a premium. Unlike many walk-in or portable greenhouses, this unit is essentially a shelving system with a greenhouse style cover to keep your plants protected. Gardeners report that the PVC cover does a terrific job of holding in heat and humidity.

    Some...MORE people have even used this mini greenhouse indoors — just bear in mind that there is no floor on the bottom, so dirt and water can drip onto the floor below. The only common complaint about this greenhouse is that the shelves do not hold up too much weight. Users have worked around this by placing plants on the center of the shelf where the tubular frame system is, and others have used cable ties to keep the shelves from tilting. For seedlings or small plants, this shouldn’t be a significant problem, but for larger plants, you may want to invest in a larger and more substantial greenhouse than this mini version.

  • Outdoor Living Today Cedar 8 ft. x 12 ft. Greenhouse Kit

    Best Cedar: Outdoor Living Today’s Cedar Greenhouse Kit

    Cedar is known for its excellent durability and resistance to insects and pests, so a greenhouse made from cedar would be a natural choice. Outdoor Living Today’s Cedar Greenhouse Kit is a popular choice for a cedar greenhouse.

    This greenhouse measures 8' x 12' and will be both a functional and aesthetically-pleasing addition to your green space. The cedar greenhouse will require you to assemble the parts and pieces before diving into your horticulture, but users report that the pieces...MORE were all numbered and that assembly was relatively easy. A few people commented on some boards being rough or split, but overall, the assembly process wasn’t a big concern.

    One of the great features about this greenhouse is that the vents open automatically depending on temperature — so you won’t need to run outside to manually open or close the vents every time the temperature fluctuates. This Cedar Greenhouse Kit is pricey — and costs significantly more than many other styles of greenhouses. However, the beautiful and practical cedar finish is a great choice for gardeners that are serious about having a year-round space to protect and nurture their plants.

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  • Best for the Growing Enthusiast: Palram Snap & Grow 8’ Series Hobby Greenhouse

    If you have a green thumb and like to try your hand at growing all sorts of plants — and lots of them — then you need a supersized greenhouse like the Palram Snap & Grow Hobby Greenhouse.

    Available in a few sizes, the Snap & Grow Greenhouse polycarbonate walls provide a clear view of your plants inside, supported by a strong and sturdy aluminum frame and galvanized steel base. It has a vented roof and integrated rain gutters. However, you will need to buy shelves separately.

    As with many...MORE greenhouse kits, the assembly process can be a challenge. One person pointed out the importance of having a level piece of ground for assembly, wearing gloves to protect against cuts from the polycarbonate and aluminum, and the help of another person. All of that being said, though, the finished product is a large, sturdy greenhouse that will be big enough for plants large and small. It’s also backed by a five-year limited warranty, and the company offers US-based customer support — so you can have some piece of mind if issues do arise. For a large greenhouse that allows you to install your own shelving to meet your needs, choose the Snap & Grow Greenhouse.

  • Palram Plant Inn 4 ft. x 4 ft. Polycarbonate Greenhouse

    Best with Storage: Palram Plant Inn

    Gardening involves a lot of tools and supplies — so a greenhouse that includes storage space just makes sense. The Palram Plant Inn is our top choice for a greenhouse with built-in storage.

    The Plant Inn is a compact greenhouse with 4' x 4' of plant space, and a peaked roof that can be opened for irrigation, vented for cooling, or completely closed. Down below the greenhouse space is a storage compartment large enough to fit fertilizer, hoses, watering cans, and more. This is a great...MORE choice for gardeners who don’t have a separate shed to keep supplies in — and it’s also more convenient to keep necessary tools close.

    Users are mixed on the quality of the materials — especially for the price — but the design is hard to beat. Overall, people were pleased with the functionality of this greenhouse and it makes a great buy if you’re interested in integrated storage.

  • 4 Ft. W x 6 Ft. D Lean-To Greenhouse

    Best Lean-to: OGrow Lean-to Greenhouse

    If you’re looking to add a lean-to greenhouse to the back of your house, garage, or other structure, then the OGrow Lean-to Greenhouse is the perfect solution.

    The four by six-foot lean-to will easily add a perfect growing space onto any existing structure you have. By situating the greenhouse close to a building, you can help protect tender vegetation — and have easy access to your plants. Constructed of polycarbonate panels and an aluminum frame with reinforced steel base, the OGrow lean-to is...MORE sturdy once assembled.

    The assembly of this greenhouse is an investment of time, but the results are well worth it according to users. It features a sliding door for entry and exit, and a roof vent to help control the temperature and humidity. If you are looking for a lean-to greenhouse, this sturdy version from OGrow is a great choice.

  • Greenhouse by Gardman

    Best Cold Frame: Gardman Cold Frame Greenhouse

    The Gardman Cold Frame Greenhouse is a great choice if you’re looking to extend your growing season or harden-off new plants.

    The FSC-timber frame is sturdy and users report that assembly was simple and took only a matter of minutes. The polycarbonate windows can be opened for ventilation, watering, or pruning and have a locking mechanism to keep them in position.

    The cold frame greenhouse can be anchored down, or keep it portable and position it over plants as your gardening needs change. It’s...MORE three feet wide and three feet deep, so use just one for protecting a small set of plants or purchase several to protect larger groups.

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