There are more resistant forms of Phlox paniculata, in particular a white flowered one called David if you want to replace this. If not powdery mildew has yet to kill any of my phlox, though it sure is ugly if the plant is very visible. You can reduce its likelihood next year with good culture, though not necessarily prevent it. This fall, remove all the stems and leaves after the first frost and throw it out - don't compost it. Put new mulch under the plant to prevent the spores from splashing onto new growth next spring. As it grows next year, cut out enough of the stems so that the foliage isn't crowded and gets good air flow. Water with soaker hoses if needed, don't wet the foliage. If you want to use a fungicide (I don't like to as they may cause problems for various critters or groundwater) you really need to use it before it gets this bad - using it now won't really help. Start using it at the very first sign of PM.

Almost finishing up now....here are some of the last - Maguire's 'Brendan Paul' A brave flowering of an unrooted ' Mandela' trying to do its best in the hot weather. Next year it should put on a good performance. The colour is a deep lush black/red and not the colour that shows on my camera.

Could this be it? Mexican Hat Coneflower Mexican Hat (also known as upright prairie coneflower, long-headed coneflower, and Mexican Hat Flower) is an interesting native perennial that has unique blooms. The flower has somewhat resemble sombreros (hence the common name!). Mexican Hat (Ratibida columnifera) is part of the prairie coneflower group, and in the aster family.

Red are Impatiens, pink are Fuchsia.