From: About.com Gardening

A lot of us have been having damp or humid summers and while a
little water is great, too much dampness for too long can cause all
kinds of problems. Even the seemingly carefree plants, like
clematis, can start acting up. Problems that take hold in June
really start showing symptoms in July, so keep a close eye on your
plants. If your clematis was blooming fine and now the stems &
leaves are starting to look brown, it's probably not because they
need more water. It could very easily be a case of clematis wilt, a
fungus disease that loves damp foliage and humid weather. The good
news is that it doesnÂ’t attack the clematis roots. The
bad news is that all affected portions will need ...
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