Pruning Scotch Broom: Renovate Leggy Shrubs & Check Invasive Status

Renewal Pruning for Old, Woody Scotch Broom

Cytisus scoparius gets leggy and bare at base. Best reference: Colorado State: Pruning Flowering Shrubs.

General Approach

1. After flowering (late spring), cut 1/3 of oldest stems to ground.
2. Repeat annually for 3 years to fully renew.
3. Or, for severe cases, cut all to 12–18″ (rejuvenation) – sacrifices one year's bloom.

Critical Warning: Invasive in Western States

Scotch broom is a **noxious weed** in WA, OR, ID, CA, and others. **Do not propagate or plant there.** Check your state's list before managing.

If in a non-invasive region, prune boldly—it responds well.