Nick, one is about 12', another 15', each has a smaller one growing a few feet from it. They are a woody plant with a bark and so I am assuming they will be a tree. I don't know of many things that height up around here that aren't trees except maybe Hog weed.
Also, I was reading they are full sun type plants but these are shaded quite well most of the day by several other trees. wondering if this might slow down flowering...