Last year a lot of people complained about Bombshell not blooming. I recall having to call Bally Hort who suggested doing no pruning of any type whatsoever. Still, people complained. Try doing searches in the forum for the word "bombshell" or the words bombshell problem to see what posts you find. I am not familiar with SugarPuff but its claim to fame is a compact size for a paniculata.

Thanks. I will research some more.

Try Bobo. Rave reviews about that plant...