Posted: 29/04/2016 at 22:15
It depends what you intend to use one for really. Greenhouses are better for starting off seeds and overwintering plants as they tend to stay a few degrees warmer than polytunnels. If you want to grow a large crop of tender plants such as tomatoes, peppers and aubergines etc., then polytunnels work out a lot cheaper when large areas (eg anything over 6 ft x 10ft) are involved. However, avoid really cheap polytunnels and go for a quality one if that is your goal as they will last a *lot* longer before the cover needs replacing. If you have plenty of space I would go for a smallish glass greenhouse for raising your plants and a large polytunnel for growing them in.