I planted two smoke trees near one another and at the same time. One has bloomed for two seasons now and the other has never bloomed. The two trees, while definitely smoke trees, look quite a bit different. The one that hasn't bloomed is undersized compared to the blooming tree. I expect that when the smaller tree catches up that it will begin to bloom. But who knows. Both have been in the ground about five or six years now.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.