BC It is frost protect fabric (I think the same stuff you use for row covers). It was like $8.00 a pack for a 25' X 4' piece from WM but other places sell it too.
DC My setup in no way would replace any type of greenhouse. It is just like a row cover (I think). It had no heating or cooling systems. The only reason I even built it was because my seedlings got too big too fast. I was going to be away from home for some time in May and no one was available to look after them or to cover them if there were a frost. I also had numerous leaf problems last season but mine were due to me knowing nothing about growing tomatoes. I planted some of them in the rain when it was cold and over-pruned them. So far this season I have healthy plants as well but I think it is because of a pretty good run of weather these last 3 weeks or so. I have also learned a lot from this and other gardening websites.
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