Diagnosing Dark, Shriveled Growth on Hydrangeas: Disease Identification Guide

Symptom Check

Dark, shriveled areas on young, tender hydrangea growth often indicate fungal or bacterial diseases such as anthracnose, botrytis blight, or bacterial leaf spot. Environmental stress (frost, sun scorch) can mimic these symptoms.

Next Steps

1. Consult the Alabama Cooperative Extension guide (linked below) for detailed photos and descriptions of common hydrangea diseases.
2. Compare symptoms to identify the likely culprit.
3. Submit a sample to your local county extension office for definitive diagnosis if unsure.

Resource

Hydrangea Disease Identification (PDF) — includes images and management strategies.

General Prevention

• Water at the base, not overhead.
• Prune for air circulation.
• Remove and destroy affected leaves.
• Avoid excessive nitrogen fertilization.