I bought a Wedding Promenade in Dec and it has done great. Blooming since I bought it, but I looked at pictures from when I first got it and the current blooms are much paler. Cause? It's in a Southern window, but off to the side so it receives the late afternoon sun. I fertilize weekly, weakly. It sure looks happy enough, I'm just curious why the blooms are not as vivid. Any suggestions. thanks