I am wondering if anyone has had any experience with Weigela Czechmark Trilogy in their very northern (zone 3b/4a) gardens? I planted mine last year but they took forever to leaf out and now they remain tiny! I did not provide any winter protection and there seems to be a lot of winter dieback.... for those of you in Zone 3b/4a, I wonder how they have done for you? Should I be more patient or should I just forget about them? I appreciate your input!