Thank you for your responses so far! As far as nit going cheap on the green house, i would love to build a permanent green house, or purchase a kit at that. However thats not in the cards for me at this particular time. I am just starting out and want to see if I enjoy having a green house with little invested before I go "all out".
I would like to not be judged right off the bat here... the reason for the greenhouse will be for growing cannabis. I am a disabled veteran (USMC) and am going to see if I can grow my own plants for medicinal purposes. Basically, I dont want to take 10 pills a day (at the age of 29) for the rest of my life!
The main reason for the greenhouse is that I am interested in growing Sativa dominant plans (which offer more medical benefits rather then a "high" feeling). The problem is that Sativa based plants flower and bud later than other cannabis (Indica) plants. With the best time to harvest being late September to mid October, the reason for the greenhouse it to provide the best enviornment for the plants as it starts to cool off. Hey its Michigan, anything could happen!
Anyways, I hope im not judged because of my intentions. I do appreciate any/all help and advice!