Good question since I've been watching these 2 grow and bloom all summer. I really like the flowers, the questions that remain are about the growth habit and propagation. I have several fairly large plants of Snowstorm that are blooming well right now. The plants are very upright and have medium vigor but resist branching which tells me right off that wood from them will be in short supply. If they root well enough that may not matter too much. Icestorm is slower growing but so far appears to branch and root well enough. In any case, I am making more stock plants of both of them and some will be available next year. Famous last words, right?
Charlie