- Buddleias need full sun and fertile, well-drained soil.
- Plant in spring or fall.
- Loosen the soil, mix in compost, and dig a hole twice the diameter of the plant container.
- When placing the plant in the hole, the top of the rootball should be level with the soil surface
- Space plants 5 to 10 feet apart, depending on the variety.
- Water thoroughly.
- 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 supports leaf growth over flower production.
- Remove spent flower spikes to encourage new shoots and flower buds.
- Each spring, apply a thin layer of compost and mulch to retain moisture and control weeds.
- In cold Northern climates, spread mulch up to 6 inches deep around the trunk to nurture it through the winter.
- Buddleias are very late to break dormancy, so don't be in a hurry to assess winter damage.
- The bush should bloom abundantly even in its first year. In warmer climates, the bushes will grow into trees and develop rugged trunks that peel; peeling is normal.
- In the northern limit of their range, they behave as herbaceous perennials, dying back to the root in cold winters.
- Since they bloom on new wood, even if there is no die-back, cut them back to the ground every spring. Even where winters are mild enough for the stems to survive, prune severely to stimulate abundant growth on which flowers are borne.
- Susceptible to capsid bug, caterpillars, weevils, mullein moth, and spider mites.
- Fungal leaf spots and die-backs can occur.