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Drenching the air with a fruity scent, butterfly bush's flower spikes are an irresistible lure to butterflies and hummingbirds all summer long. The plants have an arching habit that's appealing especially as a background in informal flower borders. In warmer climates, butterfly bushes soon grow into trees and develop rugged trunks that peel.
To nurture butterfly bush through cold Northern winters, spread mulch up to 6 inches deep around the trunk. Plants will die down, but resprout in late spring. Prune to the ground to encourage new growth and a more fountainlike shape. Avoid fertilizing butterfly bush; extra-fertile soil fosters leafy growth rather than flower spikes. Remove spent flower spikes to encourage new shoots and flower buds.
Note: Butterfly bush can be an invasive pest in some areas; check local restrictions before planting it.
8 to 20 feet
To 8 feet wide