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Buddleja davidii, (Butterfly Bush) blooms on new growth. In spring is time to prune it. If you leave Buddleia unpruned, the only thing you see at eye level, in summer, is tangle of bare stems, with weak blooms at the tips. They will also grow very large. I cut mine to about 40 cm above ground. Go around all the stems and cut to just above a bud, preferably an outward facing bud. Remove any dead branches, cut any crossing branches to prevent rubbing, and remove any thin weak growth sprouting from the base. Don't worry that you're being too brutal, Buddleja is so vigorous that it will quickly regrow. The plant benefits from this hard pruning, it will send new strong shoots which will produce bigger flowers. The goal is to create strong framework of few main branches.