Renewal Pruning for an Old, Leggy Spirea

Step-by-Step Rejuvenation of Overgrown Spirea

For a 3–4 ft leggy spirea, perform renewal pruning in late winter/early spring:

1. Identify the oldest canes (thickest diameter, roughest bark).
2. Remove ⅓ of these oldest canes at ground level (or 4 in. above grade).
3. Leave the remaining ⅔ untouched.
4. Repeat annually—each year a new ⅓ is removed, maintaining a cycle of 1-, 2-, and 3-year wood.

This encourages vigorous, flower-rich young growth while preserving natural form. A pruning saw or sharp loppers works best. See illustrated guide at bruceco.com.