Pruning Hydrangea Petiolaris On Garden Wall

Hydrangea petiolaris is one of the hydrangeas that will tolerate quite
hard pruning unlike some of the shrub hydrangeas that must be pruned
with a little more care.It can be cut hard back every two years to
control its spread.Ideally this should be carried out in the autumn
following the summer flowering but it can be carried out right up until
the plants starts to shoot again in the spring.

The flowers are produced mainly on the current years growth.