Been my experience that established tall garden phlox shock easily when transplanted. Also been my experience that all of a sudden they settle in and perk up. If the weather does dry out, keep them watered. They're pretty hardy and you shouldn't loose them - especially since you transplanted them in a clump rather than trying to separate the individual stems.

I don't know if this is the best practiceÂI'd be interested in knowing what others doÂbut when moving perennials like phlox, especially at this time of year, I cut the plant down to about 4". Once it's established its root system it'll begin to grow again. GaryStPaul

I agree with the transplant shock theory. I have had phlox do the same.

GaryStPaul...I sometimes cut perennials back when I transplant as well, it depends on the plant, but at this time of year when there is plenty of growing season left, I think that you get stronger healthier growth from doing so.

My two cents...Helen