when to trim spirea

Asked July 9, 2019, 10:39 AM EDT

my spirea is done blooming, can I trim back the straggly branches now?

Sherburne County Minnesota

1 Response

Thank you for the question. Since you indicate that your spirea bloom in summer, they are likely a cultivar of Spiraea x bumalda or Spiraea japonica. They bloom on "new wood" or new growth that emerges in spring from the base of the plant. In this case, you should prune these types of spirea in late fall or winter. It's OK to remove a few stragglers now but you should leave most of the foliage to allow the shrub to store up energy for the rest of the summer.

Here is an Extension publication on pruning trees and shrubs that may be helpful: https://njaes.rutgers.edu/fs1221/

Thank you for contacting Extension.