Clematis not blooming
I have two 'Polish Spirit' clematis. One is in full sun, the other in in part shade. The one in part shade has a lot of blooms near the top and looks lovely, while the one in full sun has not a single flower on it, and no sign whatsoever of any flower buds, though it has good foliage growth. Both were purchased and planted the same year a few years ago, neither has ever been fertilized, and they receive about the same amount of water. This clematis is one that blooms on new growth, so is pruned to ~6-12" each spring.
Any clue what could be causing the one to not bloom? Could it be lack of fertilizer? Any other reason you can think of?
Thanks for any input you can offer :)