Just curious if any of you folks use a greenhouse/hoop house for growing vegetables in a zone 5 or colder climate? I am interested in getting on in order to extend my growing season on both ends...right now, I start all my seeds inside under flourescent lamps, but that is getting tight for space. I usually can't plant outside until June 1st...I'd love to be able to get things like lettuce and tomatoes( and anything else) a LOT earlier, and have another batch a lot later in the season... Is it possible, for example, to extend the growing season all the way until late November or December even? or does it become less of a warmth thing, and more of a short-day thing? Share with me what works well, and what doesn't while I am thinking about getting a greenhouse...thanks!