I have made myself two 'Polytunnels' using some spare metal poles, and a double layer of bubblewrap. These actually seem warmer than my greenhouse! As I am short on space in my greenhouse, I was wondering if my tomatoes would survive in a larger version of these "bubblehouses"?
Also, on the bare soil of my greenhouse, I have a weird white substance appearing. AI made the mistake of placing a couple of seed trays on top of it before I noticed, and lost all of the seeds in those trays, as the white stuff spread to the trays. It seemed to dry out the top layer of soil, but the bottom two thirds was saturated. Does anybody have any ideas what this is, and how to effectively get rid of it? As organically as possible, of course!
Re tomatoes: I actually meant to say that I wanted to raise them to maturity in a large "bubblehouse", as we seem to have problems growing them outdoors in my area.