Hi! I planted creeping phlox in a sloped area amongst a few trees. I planted it back in early April after the last frost. When I planted it, it had very few blooms on it and it had been purchased just a week prior at a local nursery. Since being planted, the groundcover has done absolutely nothing. It lost its already few blooms, and now has not bloomed again at all. The viney part of it is still green, but has not branched out or grown in any way either. Any suggestions?