Leaf and Stem Spot

Clematis hybrids occasionally show leaf spots and stem necrosis, but this remains a minor problem in the Pacific Northwest. Limited detailed management information is available. Ensure good air circulation, avoid overhead watering, and remove affected foliage as needed.

Leaf spot and blotch diseases are primarily cosmetic on established plants, though repeated years of heavy infection can weaken them. Rake up and remove fallen leaves to reduce the spore load going into the next season. Avoid overhead watering that splashes spores from the ground onto lower leaves. If the problem is severe, protective fungicide sprays during spring leaf emergence can help, but sanitation does more than chemistry for most leaf spots.