Nanho Blue Butterfly Bush

Nanho Blue (*Buddleja davidii* ‘Nanho Blue’) is a deciduous butterfly bush with arching, spreading branches and mauve-blue flower spikes. It flowers from late spring into fall, bringing color to a sunny border, hedge, or specimen planting. Its roughly five-foot height fits a mixed shrub garden. ## Flowers and landscape use The [Chicago Botanic Garden profile](https://www.chicagobotanic.org/plant-information/plant-finder/buddleja-davidii-nanho-blue-nanho-blue-butterfly-bush) describes mauve-blue flower spikes from May through October and notes that they attract butterflies and hummingbirds. It lists full sun, moderate moisture, and USDA zones 5–9, and suggests hedge, border, and specimen uses. ## Size and siting Chicago Botanic Garden gives a height of about 5 feet. The plant grows in full sun with moderate moisture; keep soil well drained as recommended in the [RHS growing guide](https://www.rhs.org.uk/plants/buddleja/growing-guide). Chicago Botanic Garden notes that plants can regrow from the roots after a hard winter. ## Maintenance The RHS guide recommends annual pruning for *B. davidii*; early spring pruning helps manage the shrub’s shape. Water during establishment and maintain moderate moisture through dry weather. After a severe winter, allow time for new growth to emerge from the roots.