Everything from Butterfly/Hummingbird Garden forums - to forums dedicated to permaculture and newbie gardeners!!! This site is AWSOME! http://forums.gardenweb.com/forums/
...No overstatement or exaggeration in the terminology "awsome"!! Anyone who's interested in virtually any type of plants or gardening could spend LOTS of time at the "gardenweb" site.... I'm headed back now to peruse the "trading forums"... THANK YOU for sharing this great link!
Here's another one I just came across. I know nothing about it, but it looks interesting. It's for the "city farmer": http://www.xaia.ca/cityfarmer/ Here's another one I know fairly well and I think is pretty good: http://homesteadingtoday.com/vb/ This isn't actually a regular forum, more a question and answer forum: http://www.homesteadingtoday.com/homestead/Countryside/Wc54e55bac0bc9.htm Here's one from Mother Earth News: http://www.motherearthnews.com/forums/default.asp Peace, poor_old_dad