powdery mildew on Hydrangea

Asked October 22, 2017, 12:30 PM EDT

We noticed this month what looks like powdery mildew on this black stem Hydrangea which gets partial sun and isat least 10 years old. What do you suggest? Many thanks

Baltimore County Maryland

1 Response

Hydrangeas can be susceptible to diseases such as powdery mildew or multiple fungal leaf spots later in the season, but they are generally nothing to be too concerned about and do not kill the plant. Hydrangeas in general grow best in morning sun and afternoon shade in a well drained soil with good air circulation. Pick up affected fallen leaves this fall and discard. Hopefully, given good airflow, you will not see it next season.