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Buddleja davidii is a fast-growing and undemanding shrub from China. It is ideal for a wide range of positions in the garden, providing they are sunny and the soil is well-drained. The long, heavy flowering heads transform the bush and make a stunning display for four to six weeks, attracting clouds of butterflies. Prune hard in spring to keep plants within bounds. To propagate, take hardwood cuttings in winter.