I planted a Phlox paniculata ‘White Admiral’ not so long ago, it looked healthy and started to flower lovely white flowers but then gradually and suddenly the flowers shriveled up and fell off. Some of the leaves also started to get a lot of black spots around their edge. Not all the flowers have died,…yet, and the plant looks sturdy. Just curious if I’m doing something wrong. Couldn’t find any info about it on this site so i decided to ask yourself.