Troubleshooting
Hydrangea 'Pee Gee' problems — and how to fix them
Hydrangea 'Pee Gee' (Hydrangea paniculata 'Grandiflora') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Wilting in heat
Large flower heads lose moisture rapidly in afternoon sun. Water deeply in the morning; established plants recover quickly when temperatures drop.
Powdery mildew
White coating on foliage in late summer, especially in humid conditions with poor airflow. Improve spacing and apply a potassium bicarbonate or sulfur spray.
Sparse flowering after hard pruning
H. paniculata blooms on new wood, so it tolerates hard pruning. However, cutting back after early spring delays flowering. Prune in late winter to early spring for best results.
Scale insects
Appear as brown or white bumps on stems. Treat with horticultural oil in late winter when plants are dormant.
Leaf scorch
Brown leaf margins in hot, windy sites. Mulch deeply and ensure consistent watering; a windbreak can help in exposed gardens.
Prevent hydrangea 'pee gee' problems before they start
Most hydrangea 'pee gee' issues are care-mismatch, not bad luck. Dial in the basics:
Hydrangea 'Pee Gee' problems — FAQ
Why is my hydrangea 'pee gee' wilting in heat?
Large flower heads lose moisture rapidly in afternoon sun. Water deeply in the morning; established plants recover quickly when temperatures drop.
Why is my hydrangea 'pee gee' powdery mildew?
White coating on foliage in late summer, especially in humid conditions with poor airflow. Improve spacing and apply a potassium bicarbonate or sulfur spray.
Why is my hydrangea 'pee gee' sparse flowering after hard pruning?
H. paniculata blooms on new wood, so it tolerates hard pruning. However, cutting back after early spring delays flowering. Prune in late winter to early spring for best results.
Why is my hydrangea 'pee gee' scale insects?
Appear as brown or white bumps on stems. Treat with horticultural oil in late winter when plants are dormant.
Why is my hydrangea 'pee gee' leaf scorch?
Brown leaf margins in hot, windy sites. Mulch deeply and ensure consistent watering; a windbreak can help in exposed gardens.