We have used clear plastic, but it just does not hold up very well (maybe 1 season). since we have put up a couple of smallish( but real) greenhouses we have advanced to using klerks plastic (just one of the greenhouse brands available). this is just a much better product for light transmission to the plants, it is also very durable( it has a 4 year lifespan). If you could also grow enough to sell a few, it would off set the investment of the greenhouse grade plastic. The price range for this can be wide, depending on where you can buy it. We have an amish supplier close, so it is very reasonable there, Check around at greenhouses where you see polyhouses and ask where they get theirs or ask if they have any extra they can sell you. Have you thought about installing a permanent hightunnel? you can extend your growing season by a month or 2 maybe even more. It doesn't have to be a new frame. We have bought several off craigs list very reasonable. We are zone 5 and we planted 30 tomatoes today in one. We protect them with wall o waters for the first month and then take those off and put cages around them when the forecast looks as if it isn't going to freeze anymore. Then we expect to harvest in there until at least Oct.
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carolyn k
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