This is the first year my phlox have bloomed well and I really have been happy with them. They have bloomed over a month. However, now the leaves are starting to turn brown, though they are still blooming. The leaves are just brown and sort of withered but I don't see any mottling. Is this likely to be from drought, though I've tried to keep them watered, or do phlox just turn brown when they get to the end of their season, or do they tend to suffer from some kind of rust?
Thank you in advance for any help you can give me.
