Hydrangea Won't Flower: The Old Wood Rule

A 5–7 year old hydrangea in Lancaster, PA (Zone 6b) that bloomed heavily for years but now produces only 5 flowers in June—and none since—has likely been pruned at the wrong time.

The Critical Fact

Bigleaf hydrangeas (H. macrophylla) bloom on old wood (stems from the previous season). Pruning in fall, winter, or spring removes the flower buds.

What to Do

• Stop all pruning except deadwood removal in spring.
• Apply a bloom booster fertilizer (high phosphorus) in early spring.
• Be patient—next year's buds are already forming on this year's stems.

Why Some Years Are Blank

Even with correct care, hydrangeas can be "stubborn"—late freezes, drought stress, or nutrient fluctuations can suppress flowering. Consistency pays off.

Leave the old stems alone, feed for flowers, and wait for the June show.