Garden Grow Polytunnel 3M x2M Powder Coated Steel Frame, Walk In Greenhouse, Double Zipped Door & Windows (3 x 2 Polytunnel)

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You want to make sure your polytunnel has a metal frame. The best polytunnels for an allotment or garden will have a frame made of galvanised steel, which is a very strong material. Also, make sure that the cover is pulled taut over the frame. This will prevent the wind from being able to get under flappy bits and cause damage.

To be able to use the trenching method, the cover needs to be big enough, so look out for any mention that the polytunnel is suitable for this method. You could also consider growing a hedge to break the wind, if the wind tends to come from one direction. It should be noted that First Tunnels do also offer a service where they will build it for you. We expect it’s not cheap but we can see the benefits, especially if you’re not physically able to construct it yourself. We roped in a friend to help (unlike us, he’s not vertically challenged so was very useful for reaching the higher up bits!) with the lure of cooking him a nice meal on the evening (and a regular supply of our future growing successes!).It features double stitched seams for maximum durability and has a double zip door that can be rolled up for easy access. There are also netted windows to ensure the temperature within the greenhouse can be controlled. These windows can also be covered by rolling down the PE covers.

Heavy Duty PE Cover – features extra-long sides for weighting and anchoring. It protects against harsh weather conditions – including frost and damaging UV. But you also want a polytunnel that can be fixed securely in the ground. This can be done in several ways, such as ground tubes and ground anchors, fixing plates or trenching (where a trench is dug around the polytunnel and the polythene cover is buried to keep it in place). As mentioned above, look for additional measures to strengthen the frame such as storm bars. This will ensure your frame is as strong as possible. Covering 6 square metres, there’s plenty of space for your plants to grow – as well as room for you to attend to your plants in comfort.

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If you want to overwinter slightly tender plants, your space needs will be smaller than if you want to extend your growing season, grow summer crops such as tomatoes or grow more exotic plants. Another problem that can occur in a polytunnel is moister build up. Condensation can create the perfect environment for fungal diseases, which love damp, warm conditions. To prevent the cover coming off in strong winds, you have to either fix it to the frame or use the trenching method, whereby you bury the edges of the cover in the soil. Look out for the ways the polytunnel is fixed on the ground to assess if it will be strong enough for your particular weather conditions.