I would guess drought ... we've had a dry winter/spring/early summer, and that clem is under a tree which will be taking most of the moisture, as well as shading off any rain. A couple of buckets full of water at least three times a week from early March throughout the growing season is my remedy.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Drought or damage to the stem. Clematis wilt starts at the bottom of the plant and works up. Drought starts at the top and works down.
I would look for something having eaten the stem somewhere.
Cut the damage out ?
I would guess drought ... we've had a dry winter/spring/early summer, and that clem is under a tree which will be taking most of the moisture, as well as shading off any rain. A couple of buckets full of water at least three times a week from early March throughout the growing season is my remedy.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.