If you grow Clematis, at some point you will encounter Clematis Wilt.
What happens when Clematis Wilt strikes is fairly dramatic, and almost overnight the all or parts of the plant will go brown, and collapse.
The plant will look as if it is very dry, all brown and droopy, but in fact, it is the dreaded wilt. The general view is that Clematis wilt is caused by a fungus ( Calophoma clematidina [syn Phoma clematidina, Ascochyta clematidina]). It is also true to say that scientists are not 100% sure that this is the cause, as Clematis wilt also seems to occur where there is no evidence of fungus.
In the image wilt has attacked part of the plant but not totally affected it and some flowers are present but the plant looks shabby. Clematis wilt may or may not affect the plant the following year. More often than not, if the weather conditions are different, the wilt may not appear the next year. There may even be healthy shoots at the base of the plant if the wilt is not too widespread.
In these cases it is usually environmental causes which include how the Clematis has been planted, and it's growing environment, see below.
Whatever causes Clematis Wilt, what to do about it?