Mine bloom much better with sun, and, in fact, become a sheet of solid color for a very short period. The only two sorts I have a 'Bruce's White' and the medium blue-purple 'Blue Ridge'.

Bogturtle is probably right about the amount of sun being the problem.

ok, but it sure seems I've seen them blooming in woodland gardens, with not much more light than mine. I don't doubt you, but maybe higher, dappled shade is needed.

Thanks

I do not try this, but people who have the energy or can hire someone, trim the bottom limbs so there is only a high canopy. This seems to encourage shade tolerant plants. I know some people grow Phlox divaricata(or some such spelling) and get solid sheets of bloom in high shade. Have seen some really beautiful pictures on the forums. I have not succeeded with this plant. I just suspect my soil is too acid, sandy and well drained. But it may be, as well, that I have only tried single purchases that get overwhelmed by plants that are presently thriving here.