http://durgan.org/2017/May%202017/13%20May%202017%20Collards/HTML/ 13 May 2017 Collards Four collard plants were moved from the small greenhouse to the outdoor garden. These plants grow about three feet tall and produce green edible leaves all Summer. Basically a cabbage that doesn’t form a head. What I don’t use fresh is added to any juice being made at the time.