Can you start a collard tree in Sept in zone 7? And is it the same thing as a walking stick tree?
Certified GKH Gardening Expert
There are several plants known as walking stick tree, one of which is walking stick kale aka Jersey cabbage. The tree collard (Brassica oleracea acephala) is not the same as walking stick kale (Brassica oleracea longata), but they are both varieties of the same species that also includes cabbage, broccoli, ordinary kale, and ordinary collards.
I am not sure about tree collards, but regular collards can be started in fall as described in the following article, so the same is probably true of their taller cousins: