Butterfly bushes grow and flower best in full sun. They will grow fine in part shade, especially in warmer climates, but their flowering may be reduced.
Soil, Butterfly bushes are not particular about the soil conditions, as long as it drains well. Poorly-drained soils can cause root rot.
Water freely when in growth and sparingly otherwise. In the summer, water if rainfall is less than 1 inch per week.
Avoid fertilizing butterfly bush too much, fertility promotes leaf growth over flower production. Remove spent flower spikes to encourage new shoots and flower buds.
Butterfly bush need perfect drainage.
Butterfly bush can grow in clay soil, but require a few special accommodations.