Best Greenhouses & Cold Frames — Plastic + 1 Year (2026)
6 greenhouses & cold frames matching material “Plastic” + warranty “1 Year”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our Best Greenhouse UK (2026) guide.
£19.99
Pros
- Reinforced weatherproof PVC cover
- Roll-up zip door for easy access
- Tool-free assembly, ideal for patios
Cons
- Less sturdy than a full-size greenhouse
- Cover needs replacing after a few seasons
#2 Pick
Outsunny Polytunnel Greenhouse with Windows and Door, 3 x 2m- Plastic
- Large gardens
- 1 Year
£56.99
Pros
- Galvanised steel frame for durability
- Roll-up door and mesh windows for ventilation
- Walk-in height suits full-size crops
Cons
- PE cover less durable than polycarbonate or glass long-term
#3 Pick
Oypla Growbag Tomato Growhouse Garden Greenhouse with PVC Cover, 150x100x50cm- Plastic
- Balcony/patio
- 1 Year
Currently unavailable
Pros
- Sized to fit standard growbags
- Sturdy tubular steel frame with PVC cover
- Roll-up zipped door for ventilation
Cons
- Best suited to patios rather than full-size crops
£45.00
Pros
- Compact 4-tier design suits patios and balconies
- Clear PVC cover lets in plenty of light
- Roll-up door for easy access and ventilation
Cons
- Lightweight frame less stable in strong winds
#5 Pick
Palram Canopia EcoGrow 6x8 Greenhouse, Green- Plastic
- Small gardens
- 1 Year
Currently unavailable
Pros
- Affordable entry point into full-size greenhouses
- Resin frame resists rust and rot
- Reinforced polyethylene cover lets in plenty of light
Cons
- Cover less durable long-term than polycarbonate or glass
#6 Pick
Gardman 4 Tier Mini Greenhouse Shelving Unit- Plastic
- Seed Starting
- 1 year
Currently unavailable
Pros
- Four deep shelves for pots and seed trays
- No-tool push-fit steel frame assembly
- Roll-up zippered door for easy access
Cons
- PE cover is less durable than polycarbonate panels
At a glance
- Products
- 6
- Price range
- £19.99–£99.99
- Average price
- £47.65
- Average rating
- 4.18 / 5
- Total reviews
- 5,428
- Top brand
- Gardman (2)
- Price tier split
- Budget4Mid-range2Premium0
- In stock
- 3
These plastic greenhouses and cold frames offer a budget-friendly solution for extending your growing season. Constructed from durable, lightweight plastic, they provide protection from the elements – frost, rain, and excessive sunlight – allowing you to cultivate tender plants or start seedlings earlier than would otherwise be possible. A one-year manufacturer’s warranty provides reassurance against material defects and ensures peace of mind during your initial use.
These models are typically suitable for smaller gardens or raised beds, offering a compact footprint without sacrificing vital growing space. The plastic construction is easy to clean and maintain, resisting damage from typical garden conditions. Remember to check the dimensions carefully before purchasing to ensure they will fit within your allocated space.
While these greenhouses offer basic protection, consider adding ventilation options – either manual or automated – for optimal temperature control inside. Securely anchoring the frame to the ground is crucial, especially in windy areas, to prevent tipping and damage. Always consult the manufacturer’s instructions for assembly and care.
FAQ
What are the typical dimensions of these plastic greenhouses?
Dimensions vary between models but generally range from 6ft x 4ft to 8ft x 6ft. Check the product specifications carefully before purchasing to ensure it fits your intended location.
How durable is the plastic construction?
The plastic used is typically a high-density polyethylene (HDPE), offering good resistance to UV rays and impact. However, sharp objects or rough handling can cause damage; careful placement is advised.
Do these greenhouses require assembly?
Yes, all models come with detailed instructions and require assembly. Most users find the process straightforward but allow ample time for completion.
What kind of plants are suitable for growing in a plastic greenhouse?
You can grow a wide range of plants, including tomatoes, peppers, cucumbers, strawberries, and various leafy greens. However, consider ventilation to prevent overheating during summer months.
How long will the warranty last?
The one-year manufacturer’s warranty covers defects in materials and workmanship. Damage caused by misuse, neglect, or extreme weather conditions is typically not covered.
What should I do if a part breaks during assembly?
Contact the retailer (e.g., Amazon) for assistance with replacement parts. Refer to their standard returns policy for options regarding damaged items.
Are these greenhouses suitable for outdoor use only?
Yes, they are designed specifically for outdoor use and should not be used indoors due to potential ventilation issues and UV exposure.
How do I clean the plastic greenhouse after use?
Simply wipe down the exterior with a damp cloth and mild soap. Avoid using abrasive cleaners that could damage the surface.
Can I stack these greenhouses on top of each other?
Generally, no. The design is intended for single-layer placement to maintain structural integrity and provide optimal ventilation.
What precautions should I take during windy weather?
Ensure the greenhouse is securely anchored to the ground using stakes or ties. Consider adding extra support if you live in a particularly windy area; avoid placing it near trees that could cause damage.