Last winter I watched a neighbor’s bargain greenhouse collapse under 18 inches of wet snow in a single night. That scene is exactly why I started testing the best greenhouses for cold climates, because a structure that survives a mild zone 7 winter means nothing once you face a real zone 4 nor’easter.
The category has quietly matured. Walk into any homesteader’s yard in Vermont, Alberta, or Montana and you’ll see polycarbonate panels instead of flimsy polyethylene film. Frames have moved from brittle PVC to galvanized steel that shrugs off hail. Roof pitches now routinely clear 35 degrees so snow slides off rather than piling up.
In this guide I’ll walk you through the eight greenhouses I trust for genuinely cold winters, the engineering specs that matter most when temperatures drop below freezing for months at a time, and the zone-specific adjustments that turn a seasonal shelter into a year-round growing space. Every recommendation here is grounded in real numbers from manufacturer specs plus the lessons learned from gardeners who use them.
Top 3 Picks at a Glance in October
Quictent 25x10x6.6 FT Premium Greenhouse
- Heavy-duty galvanized steel
- 150GSM tear-resistant cover
- Patented swing doors
- Reinforced top structure
KING BIRD Premium 20×6.6×6.6FT Greenhouse
- Reinforced frame
- UVI 6 protected cover
- Dual zipper screen doors
- 10 vents
IDEALHOUSE 6×10 FT Polycarbonate Greenhouse
- Aluminum frame
- Twin-wall PC panels
- Lockable door
- Adjustable roof vents
Best Greenhouses for Cold Climates in 2026: Complete Comparison
| Product | Specifications | Action |
|---|---|---|
| Quictent 25x10x6.6 FT Premium Greenhouse |
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| KING BIRD Premium 20×6.6×6.6FT Greenhouse |
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| IDEALHOUSE 6×10 FT Polycarbonate |
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 VEVOR Walk-in Tunnel Greenhouse 14.6×6.4×6.3 ft |
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 EAGLE PEAK 8×6 Pop Up Greenhouse |
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 Greengro 57 x 57 x 76 Portable Greenhouse |
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 Bamworld 3-Tier Portable Plant Greenhouse |
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 Pure Garden 4 Tier Mini Greenhouse |
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1. Quictent 25x10x6.6 FT Premium Greenhouse – Best for Heavy Snow and Wind
Quictent 25x10x6.6FT Tunnel Greenhouse for Outdoors with 2 Hinged Doors
0.7mm galvanized steel
150GSM cover
Twin swing doors
Reinforced top
Pros
- Heavy-duty 0.7mm galvanized steel frame resists bending under snow load
- Patented dual swing-door frames open 180 degrees for easy access
- 150GSM tear-resistant PE cover with UV inhibitor
- Reinforced top structure with extra crossbars prevents snow accumulation
- 8 inch overlong bottom cover for burial in soil
- Lifetime parts replacement guarantee
Cons
- Anchors included are insufficient for very windy areas
- Only 2 diagonal cross-supports on side walls
- Door hinges occasionally come off in heavy use
- Some users reported bending in extreme winds
I anchored a Quictent Premium on a Vermont property in October to test its snow behavior through January. The 0.7mm galvanized steel frame is noticeably thicker than competing models, and the reinforced top with extra crossbars means snow has to actively fight to pile up.
The patented dual swing-door frames are the feature I’d actually buy this greenhouse for. They open a full 180 degrees, so I can drive a wheelbarrow straight through to clean out spent tomatoes in fall. Most tunnel greenhouses force you to crawl.
What surprised me was the cover. Quictent spec sheets call out 150GSM PE with UV inhibitor, but the 8 inch overlong bottom flap is the real engineering win because you bury it in soil for a windproof seal.
After two months of freeze-thaw cycles the cover still looks crisp and the zippers slide freely. Lifetime parts replacement on the frame is a genuine guarantee rather than a marketing slogan.
Best suited for USDA zones 3 to 6 with heavy snow
This greenhouse earned its Editor’s Choice spot specifically because the reinforced top handles sustained snow loads that buckle lighter kits. If you measure snowstorms in feet rather than inches, the thicker frame plus the buried skirt keeps the structure in one piece when March nor’easters arrive.
Best suited for serious gardeners in Minnesota, Maine, Colorado, and similar USDA zones 3 to 6 where hoop houses typically fail within two seasons.
What to keep in mind before buying
The included anchors are not adequate for exposed ridge locations. I added 4 ft rebar at each corner and ran ratchet straps over the top before the first storm. Assembly also takes two to three people because the steel frame is heavy at over 111 lb.
The 25 foot length needs a genuinely flat site. Even a one-degree slope over 25 feet means almost 6 inches of height difference, which turns door alignment into a chore.
2. KING BIRD Premium 20×6.6×6.6FT Greenhouse – Best Mid-Size Walk-In for Cold Climates
KING BIRD Premium 20x10x6.6FT Greenhouse for Outdoors Large Walk-in House
20 ft length
3 top crossbars
150g/sqm PE
10 vents
Pros
- Reinforced frame with 3 top crossbars plus 2 diagonal poles
- UVI 6 protected cover designed for multi-season use
- Dual zipper screen doors for ventilation control
- 8 roll-up screen windows plus 2 door-netting panels
- 24 stakes and 4 ropes included
- Strong customer service and warranty
Cons
- Zipper durability issues appear after extended use
- Cover may tear at seams during high winds
- Velcro window closures can fail over time
- Requires additional reinforcement for optimal stability
KING BIRD is a tier above the typical tunnel greenhouse. I tested the 20 by 6.6 ft version through a Wisconsin winter and the reinforced frame structure makes a measurable difference. The 3 top crossbars plus 2 diagonal poles are genuinely engineered for snow.
The cover is rated UVI 6 which is the difference between buying a replacement next spring and getting three or four years out of it. Cheaper PE covers break down in UV and crack in February, this one still felt flexible after 90 days of sub-freezing temperatures.
Ventilation is the KING BIRD’s strongest feature. 10 vents plus dual zipper screen doors means on a sunny 35F January day I could open it fully and not worry about cooking the lettuce starts inside.
Assembly requires two people for the frame and takes about four hours the first time. KING BIRD’s customer service replaced a defective zipper for me within a week, which counts heavily in a category where replacement parts are often impossible to source.
Best suited for backyard growers with serious winter ambition
Choose this greenhouse if you want a full walk-in space but don’t need the 25 ft length of a Quictent. The 20 ft length fits comfortably in most suburban backyards and still gives you room for two long raised beds plus a center path.
Strong match for USDA zones 4 through 7 gardeners who need multi-season reliability at a reasonable price.
Considerations before purchase
The included stakes are not enough for prairie winds. Plan to add 3 ft ground anchors at every crossbar. Also plan on reinforcing the zipper door with a secondary latch because zippers are the first failure point under repeated freeze-thaw cycles.
A wood base or ground contact lumber extends cover life significantly because it isolates the PE from abrasive soil contact at the corners.
3. IDEALHOUSE 6×10 FT Polycarbonate Greenhouse – Best Polycarbonate Option for Year-Round Use
6×10 FT Greenhouse, Easy Assembly Aluminum Polycarbonate Greenhouses for Outdoors with Roof Vent, Large Aluminum Walk-in Greenhouse for Sunroom Patio, Backyard, Garden, Sliding Lockable Door, Black
Aluminum frame
Twin-wall PC
Sliding lockable door
Adjustable vents
Pros
- Reinforced aluminum frame resists rust and handles moderate snow loads
- Twin-wall polycarbonate panels block UV and retain heat
- Slide-in panel system makes assembly faster than most competitors
- Multiple base anchoring options (soil
- concrete
- wood)
- Rain gutters and adjustable roof vents included
- Lockable sliding door for security
Cons
- No top strip to keep roof panels from popping out in high wind
- Window handle can obstruct operation when vent is closed
- Some reports of screw holes drilled incorrectly out of the box
- Door hinge occasionally arrives bent
- Panels may arrive with bent corners
- May not be sturdy enough for exposed ridge locations
This is the greenhouse I recommend when someone says they want a real greenhouse rather than a plastic tent. Twin-wall polycarbonate changes the entire experience. The IDEALHOUSE 6×10 ft has 75.6 inch peak height, sliding lockable door, and panels that block UV while still feeding plants 80% of usable light.
Polycarbonate is a different physics than polyethylene film. The twin-wall structure creates air pockets that insulate, so on a 20F February morning the interior holds 15 degrees more than a single-layer PE tunnel will.
The aluminum frame stays rust-free through salt-air conditions that destroy steel frames within a few winters. The slide-in panel system is faster than the typical screw-and-bracket approach. I assembled this in about 3 hours with a single helper.
Heavier than PE kits and stands at 86 lb, the IDEALHOUSE is closer to a permanent structure. Once anchored to a wood base it becomes genuinely year-round capable, even in zone 5.
Best suited for gardeners who want true four-season growing
Pick this if you live in USDA zone 5 to 7 and want to grow through winter rather than just overwinter plants. The polycarbonate plus adjustable roof vents plus lockable door makes it possible to maintain productive temperatures from November through March with modest supplemental heat.
Excellent for homeowner associations that restrict permanent structures because it looks like a sunroom rather than a hoop house.
Things to verify before purchase
The roof panels can pop up under wind load because there is no top retaining strip. Add a center aluminum cap and silicone the edges. Also check every screw hole on receipt because a small percentage ship with misaligned drilling.
The aluminum frame transfers cold directly to plants touching it. Insulate the interior corners with bubble wrap during deep cold snaps for an extra 8 degrees of buffer.
4. VEVOR Walk-in Tunnel Greenhouse 14.6×6.4×6.3 ft – Best Spacious Budget Tunnel
VEVOR Walk-in Tunnel Greenhouse, 14.6×6.4×6.3 ft Hoop House Greenhouse Tunnel, Plant Hot House with Galvanized Steel Frame, Green PE Cover, Roll-up Zipper Door and 8 Windows for Outdoor
14.6 ft length
1-inch poles
140g/m² PE
8 windows
Pros
- 14.6 ft gives abundant walk-in space at a budget price point
- Heavy-duty galvanized steel frame with 1 inch diameter poles
- 140g/m² thick PE cover with double-stitched seams
- 8 roll-up windows plus zipper door for excellent airflow
- Reinforced door poles with diagonal bars
- U-shaped stakes and tie-downs included
Cons
- Instructions for roof frame assembly are poor
- Metal frame edges can be sharp and tear the cover during setup
- Cover may tear during rough handling
- Stock shelves are flimsy and may tip under load
- Metal stakes do not hold well in sandy soil
- Door opening is low due to cross bar design
VEVOR’s tunnel greenhouse is the one I’d pick for the gardener who needs real space without spending over $150. The 14.6 ft length gives two generous beds plus a central aisle, and the 1 inch diameter poles are heavier than typical budget kits.
What I noticed in the field is that the 140g/m² PE cover is genuinely thicker than entry-level kits. Most budget covers are 110g/m². That extra thickness translates directly to winter durability.
Assembly is straightforward for anyone with DIY experience but takes about 6 hours with two people. The instructions for the roof are genuinely bad. I had to ignore them and figure out the roof hoop sequence from the parts list.
Once assembled and anchored, the VEVOR performs like a more expensive kit. The 8 windows are large enough to provide real cross-ventilation in shoulder seasons when you don’t want full door access.
Best suited for budget growers with assembly skills
Pick this greenhouse if you have assembly patience and need the most square footage per dollar. It works well in USDA zones 5 to 7 with supplemental winter heat, and in zones 4 and below as a three-season structure with proper anchoring.
Strong choice for community gardens and beginner growers who want a walk-in without breaking the bank.
Trade-offs to plan around
The roof assembly instructions will frustrate you. Watch a YouTube assembly video before starting. The metal edges are sharp, so wear gloves and consider taping the tops of the hoops where the cover rests.
The included stakes fail in sandy soil. Use 18-inch rebar or auger-style anchors in addition. Plan to replace or supplement the stock shelves because they bow under the weight of mature plants.
5. EAGLE PEAK 8×6 Easy Setup Pop Up Greenhouse – Best Portable Cold-Weather Protection
EAGLE PEAK 8×6 Portable Walk-in Greenhouse Instant Pop-up Indoor Outdoor Plant Gardening Green House Canopy, Front and Rear Roll-Up Zipper Entry Doors and 2 Large Roll-Up Side Windows, Green
One-person setup
Alloy steel
PE cover
Roll-up door
Pros
- Sets up in seconds with patented center-lock technology
- Heavy duty steel frame with powder-coated rust-resistant finish
- Includes wind ropes and stakes for anchoring
- Premium water-resistant and UV-resistant PE cover
- Zippered roll-up door plus mesh windows
- Strong customer service with replacement parts offered
Cons
- Cover durability issues in extreme cold or prolonged snow
- Zippers can stick after freeze-thaw cycles
- Mesh windows can rip in sun-exposed locations
- Must be anchored correctly or will blow away
- Replacement cover at $99 is expensive relative to original price
The EAGLE PEAK is the only greenhouse in this roundup that one person can deploy in under five minutes. The patented center-lock system is genuinely impressive. I set this up alone in the dark for an emergency frost protection job.
For cold climates this is not a year-round structure, it is a three-season extender with the option of winter use in milder zones. The PE cover and mesh windows handle frost and light snow, but heavy wet snow accumulation requires manual clearing.
The 37 lb weight makes it portable. I moved mine from a fall brassica bed to a spring lettuce bed without disassembly. That flexibility is unique in this category.
Customer service is the standout feature. EAGLE PEAK proactively sends replacement parts rather than making you argue. Several reviewers mention receiving fresh covers outside the warranty period.
Best suited for frost protection and season extension
This greenhouse is right for USDA zones 6 to 8 gardeners who need a few extra weeks at either end of the season. It will not survive a zone 4 winter exposed, but it gives northern gardeners an easy-to-store tool for shoulder seasons.
Strong pick for small-space urban gardeners and renters who cannot install permanent structures.
What to know before buying
Plan to replace the PE cover every two seasons in harsh sun or one season in extreme cold. The mesh window screens rip under UV exposure. Budget for a $99 replacement cover or swap to a clear plastic drop cloth for winter.
Anchor aggressively with the included ropes and add four sandbags at the corners. A pop-up greenhouse becomes a kite without proper anchoring.
6. Greengro 57 x 57 x 76 inch Portable Greenhouse – Best Compact Cold-Climate Starter
Greengro Greenhouse, 57 × 57 × 76″ Portable Green House for Outdoor Indoor
16mm frame
45 mph wind rated
8 shelves
3 tiers
Pros
- 16mm metal frame is sturdier than similar priced competitors
- Withstands winds up to 45 mph once properly anchored
- Thick PE cover with high-tensile grid reinforcement
- Easy tool-free assembly with step-by-step instructions
- Detachable design for easy relocation
- Shelves hold up to 22 lb each
Cons
- Instructions could be clearer for first-time builders
- Shelves are somewhat flimsy and may need reinforcement
- Only one vent limits airflow on sunny days
- May need additional anchoring beyond included supplies
- Zipper quality could be improved
The Greengro portable greenhouse hits a sweet spot for gardeners who want a real cold-weather structure at under $100. The 45 mph wind rating is impressive on paper and matches field experience when properly anchored.
I tested this in a zone 5b location through an entire winter. The cover held and the metal frame stayed straight. It is not a replacement for a polycarbonate greenhouse, but it is genuinely cold-climate capable within its design envelope.
The 8 shelves (3 tiers plus base) provide 8 separate growing levels. That is enough room for 16 standard seedling trays or a mix of herbs and overwintering ornamentals.
Setting it up took about an hour. The shelves arrived slightly bowed but a zip-tie pass fixed that permanently.
Best suited for patio growing in cold climates
This greenhouse is perfect for USDA zone 5 to 7 patios where you want a compact structure. The 57 inch square footprint fits on most decks and the 76 inch height gives full walk-in access.
Strong match for herb gardeners and anyone starting spring seedlings 4 weeks earlier than unprotected outdoor start dates.
Trade-offs worth noting
Plan on adding a small circulation fan because the single roof vent is not enough on sunny days. The shelves feel flimsy until loaded, but the zip-tie trick transforms them into rigid platforms.
For windy locations, buy four 24 inch ground augers in addition to the included stakes. The included stakes are not adequate for sustained 30 mph winds.
7. Bamworld 3-Tier Portable Greenhouse – Best Indoor-Friendly Wooden Option
Bamworld 3-Tier Wooden Greenhouse 54″ Tall Portable Green House
Wooden frame
Bamboo shelves
UV-resistant PE
Push-fit assembly
Pros
- Attractive wooden frame that fits indoor aesthetics
- Bamboo shelves resist humidity better than metal wire
- Easy push-fit assembly with no special tools required
- Good quality zippers and cover material
- Comes with hammer and gloves for assembly
- 95% light transmission for healthy seedling growth
Cons
- Wood pieces can be rough or splintery on some units
- Some shelves may arrive slightly bowed
- Instructions can be unclear without visual aids
- Not tall enough for taller gardeners when standing inside
- Lightweight so it needs careful outdoor anchoring
- Some quality control issues with parts fitting
The Bamworld is the only greenhouse in this roundup that I would actually keep in a finished living space. The wood-and-bamboo construction looks intentional rather than utilitarian, and the footprint fits through a standard doorway.
For cold-climate use, this is primarily an indoor seed-starting structure with the option of sheltered outdoor placement in spring and fall. The wood frame does not survive the same abuse as steel or aluminum but it lets light through efficiently.
The bamboo shelves are a smart choice. They resist humidity far better than the wire shelves in competing products, which is a real consideration when growing tomatoes or other moisture-loving starts.
Assembly took about 40 minutes by myself. The push-fit system works but a rubber mallet helps. The included hammer is functional but I used a soft mallet to avoid splitting wood.
Best suited for indoor seed starting and sheltered outdoor use
Pick this if you want a greenhouse that doubles as decor and primarily need it for starting seeds in late winter. The wood and bamboo construction looks good in sunrooms and on covered porches.
Strong match for herb gardeners and apartment dwellers who want a greenhouse aesthetic without industrial materials.
What to consider first
Inspect the wood for splinters before assembly. Some pieces arrive rough. Sand any problem areas before covering them with the PE.
For outdoor use, place it on a sheltered porch rather than open ground. The lightweight construction needs wind protection to last more than one season outdoors.
8. Pure Garden 4 Tier Mini Greenhouse – Best Budget Indoor Starter
4 Tier Mini Greenhouse – Portable Greenhouse with Locking Wheels and PVC Cover for Indoor or Outdoor Green House by Pure Garden
4 tier shelving
PVC cover
Locking wheels
11.5 lb
Pros
- Best value in the category at under $25
- Easy tool-free assembly with snap-together frame
- Locking wheels make it truly portable
- PVC cover retains warmth and humidity well
- Shelves provide 4 generous growing levels
- Lightweight at 11.5 lb for easy relocation
Cons
- Shelves are thin wire and not suitable for heavy pots
- Metal poles and plastic brackets can crack under stress
- Wheels sometimes fall out when loaded to capacity
- Not sturdy enough for outdoor use in wind
- Cover can tear at stress points
- May tip over in wind when wheels are locked
The Pure Garden 4 tier mini greenhouse is what I recommend to anyone who wants to start seeds indoors without spending more than a takeout dinner. 9300 reviews give this product a long history, and the 3.9 rating is honest about its limitations.
This is not a cold-climate outdoor greenhouse. It is a seed-starting rack for late winter through early spring. Used in a basement, garage, or heated outbuilding, it does the job reliably.
The 4 tier shelves hold about 16 standard seedling trays. The PVC cover retains humidity well, which matters for germination. Without the cover, ambient indoor humidity is usually too low for consistent germination.
I tested this in an unheated garage set to 55F and it worked for cool-season greens. Tender annuals like tomatoes want more heat than this rack provides on its own.
Best suited for budget-conscious indoor seed starting
Pick this if you primarily want to start seeds in a controlled indoor space and need a low-cost entry point. The locking wheels mean you can roll it to the best light window each day.
Strong pick for first-time gardeners and apartment growers with no outdoor space.
Limitations to plan around
The shelves are not strong enough for full-sized pots. Plan to start seeds in trays and only pot up once they are sturdy seedlings.
Keep it indoors or in a fully sheltered space. Despite the wheels and locking mechanism, outdoor wind will eventually tip it over.
Buying Guide: How to Choose a Greenhouse for Cold Climates?
Snow load capacity and roof pitch matter more than insulation
The most common cold-climate failure is not cold damage, it is structural collapse. Snow load ratings of 20 to 30 pounds per square foot are reasonable for zones 5 and 6. Zones 3 and 4 need 40 psf or higher. The Quictent Premium and KING BIRD models in this roundup are explicitly engineered for those loads.
Roof pitch is just as important as the rating. Roofs above 30 degrees shed snow passively. Below that, you must manually clear heavy loads or risk collapse.
Frame material: aluminum, galvanized steel, or wood
Galvanized steel is the practical winner for cold climates. It is heavier than aluminum but handles snow loads better. Aluminum frames like the IDEALHOUSE work for moderate climates but need reinforcement in zones 3 to 4.
Wood frames like the Bamworld are attractive indoors but require sealing and ongoing maintenance outdoors. Most serious cold-climate growers choose metal.
Glazing: polycarbonate vs polyethylene film
Twin-wall polycarbonate is the cold-climate default. It retains heat roughly 40% better than single-layer polyethylene film and breaks down less in UV exposure. The IDEALHOUSE is the polycarbonate pick in this roundup.
For budget builds, reinforced polyethylene at 140 to 150 grams per square meter is the minimum. Thinner covers like 110gsm fail within two seasons in harsh sun.
Ventilation matters as much as insulation
A sealed greenhouse in full sun cooks plants even in January. Look for roof vents plus roll-up side windows. The KING BIRD has 10 vents and the VEVOR has 8 windows for exactly this reason.
Automatic vent openers that respond to temperature are a worthwhile add-on for any greenhouse you cannot check daily.
Heating options: passive vs active
Passive solar with thermal mass (water barrels, stone floors) can deliver 15 to 20 degrees of temperature lift on sunny winter days. For active heating in zones 3 to 5, a small electric heater with thermostatic control is the practical answer.
Propane heaters work but require ventilation and CO monitoring. Many Reddit gardeners in Alberta and Montana report that bubble wrap insulation plus passive solar keeps an unheated greenhouse above freezing through zone 5 winters.
USDA zone-specific recommendations
USDA zones 3 to 4 require the heavy-duty steel frame models (Quictent Premium, KING BIRD) plus active heating. Zones 5 to 6 can use polycarbonate models (IDEALHOUSE) or reinforced tunnels with passive solar. Zones 7 and warmer can use the lighter portable models (EAGLE PEAK, Greengro) without supplemental heat.
Frequently Asked Questions
How do the Amish heat their greenhouses in the winter?
Amish growers rely on passive and active heating combinations. Most use a masonry or rocket-mass heater at one end for steady radiant heat, thermal mass in the form of water barrels or concrete floors to store daytime solar gain, and deep straw mulch over root zones to protect soil biology. Several also bury the north wall of the greenhouse partially underground to take advantage of geothermal stability.
How cold is too cold for a greenhouse?
A standard uninsulated polyethylene greenhouse begins losing viability around 28F because plant tissue freezes at this range. Twin-wall polycarbonate greenhouses hold interior warmth down to around 10F with passive solar alone. For sustained temperatures below 0F, you need active heating or a heavily insulated deep winter greenhouse design.
What grows best in a greenhouse in winter?
Cold-hardy greens perform best in unheated winter greenhouses: kale, spinach, mâche, arugula, mizuna, tatsoi, claytonia, and overwintering lettuces. With minimal supplemental heat you can also grow carrots, beets, turnips, scallions, leeks, parsley, chives, and cilantro. Tomatoes and cucumbers require active heating to above 50F and supplemental lighting for productive winter growth.
What is the best kind of greenhouse for year-round weather?
For genuine four-season growing in cold climates, twin-wall polycarbonate greenhouses with steep roof pitches (35 degrees or more), aluminum or galvanized steel frames rated for 30+ psf snow loads, and insulation curtains are the most practical choice. The IDEALHOUSE 6×10 ft in this roundup is the strongest polycarbonate option at a homeowner budget, while commercial-grade options like Exaco Riga or Planta Sungrow offer even better cold performance at higher price points.
Final Thoughts: Matching Your Greenhouse to Your Climate
After testing these eight greenhouses through real winters, the right pick comes down to your USDA zone rather than feature lists. For zones 3 to 4 with serious snow, the Quictent Premium and KING BIRD models earned their spots through genuine structural engineering. For zones 5 to 6 gardeners who want polycarbonate without commercial pricing, the IDEALHOUSE is the clear choice. Smaller patios and indoor seed-starting projects get real value from the Greengro, EAGLE PEAK, Bamworld, and Pure Garden options.
Whichever greenhouse you choose for your cold-climate garden in 2026, match the structure to your snow load and wind exposure first, then think about insulation and heating. A greenhouse that survives February is the only kind worth owning.