I'm currently in the process of building a 40 ft x 18 ft polytunnel and I'm excited about it! I also have the same amount of space set aside nearby for other vegetables. I'm planning to grow approximately one third potatoes, one third peas or beans, and one third pumpkins, but I'm wondering what fruits or vegetables would be best to keep outside of the polytunnel. What do you recommend?
2 Answers
It really depends on the season you’re considering. As a rule of thumb for polytunnels, try to avoid low-value, long-term crops that can take up space for extended periods. You want to maximize that area with high-value plants. Also, think about how the tunnel can extend your growing season; for instance, I’ve had success growing cauliflower and broccoli both early and late by using my tunnel.
I’d say stay away from brassicas like broccoli and cauliflower since they usually do better in cooler conditions and don’t really need the warmth of a polytunnel. Leeks fall into the same category. Traditional British veggies tend to thrive without the extra heat, and you might even want to leave them outside altogether. You can always bring in container-planted potatoes into the tunnel later for a nice harvest around Christmas. As for sweet potatoes, those love the warmth, so definitely grow those in the tunnel instead. You could also try planting soft fruits like currants and raspberries outside since they don’t enjoy too much heat. In general, many veggies can grow just fine outside during summer in the UK.