Hard to say. One of the other gardeners here had plants for 3-4 years and no blooms so when she heard about the depth thing she dug them up and replanted. And voila, they bloomed. Makes you wonder. Mine are surely on the shallow side, even being here and not putting an mulch on mine. They quite often bloom the next spring. Of the couple that haven't I think I will dig up and see what goes on. One has been in the ground three years this spring. Time enough. And it isn't the ground as there is one next to it that is about 36" tall and has gorgeous large flowers
