A few weeks ago I took a risk. Indtead of following sense and investing in an expensive but reliable glass, I decided to buy myself a cheap £30 model from Wilko. Yes, that’s right. Perhaps I have gone mad if I think that I can keep a plastic sheet and frame up against the wind on my exposed allotment site. Yet, £30 is a bargain against the £250+ that I would be expecting to pay for a sturdy greenhouse or polytunnel. Even a self-build polytunnel is a lot of time, energy and money – especially if you want the plastic sheet to keep the space warm.
Even as I pressed the order button, I was doubting my own competence. Surely a cheap plastic greenhouse like the one I’d ordered wouldn’t last more than a day on a windy allotment site?
Well, three weeks on from setting up the greenhouse, I can confidently say that it’s managed to stay up. Of course, it’s still too early in the year to tell whether the model will keep up throughout the rest of the growing season. However, £30 is still a massive saving on the expensive rates needed to buy a new frame, or the time and energy and transport needed to move a “free” model from a Gumtree advertiser’s home.
What kind of magic have I used to keep something so cheap up against the torrents of wind? Read on to find out more:
Dig Your Greenhouse In
Now, by digging in I don’t mean bury it like a plant. What I mean is measure out the space needed to fit in the base and dig down to around a spade’s depth. Once you’ve set up the greenhouse, slot this into the space. The ground on all four sides will both stop the wind from getting under the frame and lifting the greenhouse up. The ground will also be pushing the sides in.
Cover the Base, Push in the Sides
Once you’ve firmly placed the greenhouse inside the space, it’s also a good idea to get some woodchip or gravel and run a layer of it over the top of the base to secure it even further.
In addition to this, you could do what I’ve done and dig two wooden crates or supports into the ground either side of the greenhouse. This will add to the structure of the frame and stop the wind from getting anywhere vulnerable.
Reinforce Those Joins
More often than not, the problem with plastic greenhouses has been the poles coming out of their joins, causing the entire frame to fall in on itself. To stop this, I’ve reinforced all of the greenhouse’s joins with strong camping tape to keep everything in place. Alternatively, you could use any kind of strong tape to keep everything together. This is an important step, because the tape will also ensure that the frame has structure.
Follow all of these steps and you should hopefully have a greenhouse that also stays up. Just to give you an idea of how windy my allotment site is, even the strongest plastic polytunnels can suffer at the hands of the harsh gales. These thrifty ideas will give you that warm and sheltered growing space to start off some healthy vegetables this year at a fraction of the cost, time and energy needed to build a greenhouse or polytunnel.