Summer Phlox

Phlox paniculata is at its peak right now.  I have plenty of the white: 'David' and other white varieties and seedlings which all seem to be fairly free of mildew.  Then I have planted a few plants of 'Blue Paradise' and 'Nicky'--they both change color somewhat depending of the temperature.  When it's cooler as in the morning, the Blue Paradise is almost blue and the Nicky is a true violet rather than a red-violet.  They last for quite a long period and I feel that if the soil is rich and moist enought with maybe a tiny bit of shade, they don't get so much powdery mildew.