Herbicide damage

Hydrangea foliage shows burn, yellowing, or distortion after nearby herbicide application, even without direct contact. Drift from broadleaf killers injures ornamentals at distance. Use separate spray equipment, avoid application when drift is likely, and apply herbicides away from desirable plants. Maintain plant health to aid recovery.

Remove affected material as you find it and clean up any fallen debris where herbicide damage spores can overwinter. Improve air circulation around susceptible plants through selective pruning. Avoid overhead irrigation during vulnerable growth periods. If the problem is persistent, your local Extension office can recommend current fungicide or bactericide options for your specific situation.