I'm in zone 5a, and over the past few years I've tried wintersowing (gardenweb thing) and while it works pretty well for me for flowers, i don't have as good of luck with veggies. I'm contemplating a greenhouse or a cattle-panel-style greenhouse to extend our growing season a bit, and just as a fun hobby. But then I start researching and reading. It's overwhelming! And so much of the methods/advice conflicts! Fans, heat, misters, ventilation. And of course, the people who seem to know what they're talking about *only* recommend greenhouses that cost several thousand dollars, and then need modifications to withstand things like wind and snow. A little help?