10/16/2026
Hydrangeas hold the flowers for the coming year within the buds that form in autumn. Your pruning shears determine whether those blooms will ever appear.
- Most garden hydrangeas bloom on the previous year’s growth; cutting the plant back entirely—as you might a rose bush—removes all the buds, resulting in one or two summers without any flowers.
- In late winter, perform only a light cleanup: cut the faded flower stalks at an angle, 1–2 cm above the first pair of plump buds. In the interior of the Iberian Peninsula, wait until the hard frosts have passed, as the old flower heads help protect the buds beneath.
- Renew the plant gradually: remove two or three old, gray-barked branches by cutting them off flush with the base during this same pruning session.
- Learn to "read" the buds before you cut: a plump, rounded bud will produce a flower, while a flat, slender bud will produce leaves.
- Some exceptions reverse the rule: *Hydrangea paniculata* and *Hydrangea arborescens* bloom on new growth; these varieties actually require heavy pruning in late winter.
- Pruning shears do not dictate the color: blue blooms occur in acidic soil where aluminum is available, while pink blooms appear in alkaline (calcareous) soil—a single plant can even produce both colors.
Partial shade, rich soil, and plenty of water in the summer—pruning simply safeguards the potential that the soil has already promised.
