Butterfly Bush Pruning

What This Service Involves

Butterfly bush blooms on new wood, so it can be cut back hard in late winter to produce a flush of vigorous flowering stems each summer. In Western Washington we usually prune in February or early March, reducing the plant to a low framework roughly one to two feet tall to keep it dense rather than leggy. Because Buddleja is classified as a regulated noxious weed in Washington, we also remove spent flower heads through the season and can advise on sterile cultivars to limit unwanted seeding. Hard renewal pruning keeps the shrub tidy, floriferous, and less likely to spread beyond the garden.

Benefits

Produces abundant summer blooms on strong new growth; Prevents a leggy, woody, top-heavy shape through hard renewal; Supports responsible management of a Washington-regulated species; Controls size to fit beds and borders; Extends flowering when combined with seasonal deadheading

Our Process

1) Wait until late winter when new growth is about to begin; 2) Cut all stems back hard to a low 1 to 2 foot framework; 3) Remove any dead, weak, or crossing wood at the base; 4) Deadhead spent blooms through summer to reduce seeding; 5) Mulch and clean up all clippings

What Affects the Cost

Plant size and number of stems to cut back; Degree of overgrowth and woodiness; Ongoing deadheading versus one-time cutback; Concerns about seeding and noxious-weed compliance; Debris hauling

Best Time of Year

In the PNW, cut butterfly bush back hard in late winter (February to early March) before new growth emerges, since it flowers on the current season's wood.