Mine are not doing anything right now either. I was hoping to see flowers by now and I have nothing!!!
I just planted mine this past fall also.
Maybe they just need a year or two to get settled before they flower?
-renee

This is a really odd year and the micro-climates are causing extreme differences. For instance, I have 3 plants in a semicircle around an old stump, more or less shaded by it as the day progresses. They get variously from 3-8 hours of sun each day. Last 2 years all came into bloom at once in early April. This year, one is in bloom already, one is showing fat buds, and one is barely breaking ground. Growth stage is directly correlated to the sunlight they have received.

George

George is right that recent weather can affect current growth. One thing that is also important is whether the plants are going to bloom. If a plant is only two or three years old it may not break dormancy until it is ready for new foliar growth which often comes later than inflorescence growth. Look into the middle of the crown at soil level and see what is there. Of course genetics is a factor too. Some plants break dormancy very early and some much later, even in the same environmental conditions.