Urhighness88, you can certainly grow year round in a greenhouse. as aforementioned, heat could be the biggest issue. the other consideration is that during the winter months, the lower angle of the sun means you won't have as intense a light as you do in summer. this theoretically means your plants may well grow a tad slower/yield less during winter months... there are ways around that though - you could mount a 1000watt lamp inside and run it when light levels are low because its overcast etc, and to extend the amount of daylight hours you're getting. it all depends on your budget and desires - TWS showed a very nice setup that looked very affordable. it wouldn't hurt to have a cold hardy strain in case circumstances keep you from being able to keep the gh warm for a day or two.