Although this shrub isn't usually kept small like the white and purple varieties, it still does attracts many species of butterflies with their long, heavenly scented lavender flower clusters, and with the help of any milkweed or host plant, you would have an abundance of caterpillars and would be sure to enjoy your own miniature butterfly world.
How to care for Lavender Cascade Butterfly Bush
Light. Full sun is needed for good flowering; light shade is also tolerated.
Water. Water regularly while it settles in; once established it is fairly drought tolerant. Roots rot quickly in waterlogged soil, so plant where water drains away.
Soil and feeding. Give it well-drained soil, ideally pH 6.0–7.0, and only moderate feeding. Mulch 2–3 inches deep.
Size. Listed at about 2 ft. Full-size butterfly bushes reach 6–12 ft tall and 4–15 ft wide, so expect regular cutting back to keep it small.
Pruning. Cut back hard in early spring, before new growth starts, since most butterfly bushes flower on new wood. Removing spent flowers brings new blooms and prevents unwanted seedlings.
Problems to watch. Spider mites build up on drought-stressed plants. Many cultivars are prone to rust, and nematodes are a problem in sandy soil.
Good to know. Fragrant summer and fall flowers draw butterflies. In Florida plants may last only a few years; a large container filled with Potting Soil is an option.
Sources: UF/IFAS Gardening Solutions: Butterfly Bush · Clemson Cooperative Extension HGIC: Butterfly Bush
