Beautiful, fast-growing, deciduous shrub that bloom from summer to autumn. Its flowers come in many colors, white, yellow, pink and purple. Butterfly bushes are hardy to Zone 5 and remain evergreen from Zone 8 south. Classified as an invasive species in most U.S. regions.Despite the “butterfly” name, keep in mind that this shrub is not a “host plant” for butterflies in that it does not support butterfly reproduction and lifecycle. Caterpillars do not feed on butterfly bushes; rather, it only provides nectar to adult butterflies.