Next, I've had several perennials that have made no attempt at blooming.
Last year I had the most gorgeous lupins, showstoppers for sure. This year
absolutely nothing. Then there are the coreopsis which just produce nice
leaves but make no attempt to flower. Both plants get about 5-6 hrs of sun.
What gives?

I have the same problem with my Lupine, but all my other perennials are doing
fine.
Sue in Mi. (zone 5)