Rhododendron Leaves Rolling and Wilting: Cold or Disease?

In winter, rhododendron leaves often droop and curl to protect against dehydration—normal cold response. During the growing season, rolling/wilting suggests Phytophthora root rot (rhododendron wilt), common in poorly drained, wet soils (e.g., near downspouts).

Symptoms: stunted growth, yellowing, drooping leaves. Infected roots are dark and mushy. Fungicides don’t work. Fix the site: improve drainage/aeration with compost, build a raised bed, and transplant into amended soil.