This type of pruning will not affect flowering, a late spring/early summer light pruning will actually improve flowering and prolong flowers later into the season. The easy remedy is to prune established plants by a third in October/November to loosely shape the shrub then in late March/April you can prune the Buddleja down quite hard, even by another third if you wish and then the plant will grow away happily. Once the frosts arrive in late winter (January/February) these young shoots are easily frosted and this can lead to a very late leafing up in spring or even loosing the plants altogether. Pruning should be rather straight forward but often plants are pruned too hard, too early (usually around late autumn and into winter), pruning this early can promote new shoots to grow through the early winter months, this is due to many Buddleja being semi-evergreen and happily continuing to grow through a mild winter. Sugar Plum is a fairly new cultivar with long tapering clusters of pinkish red flowers with a yellow throat. Buddleja can suffer from a few problems but these are easily remedied, mostly by pruning.
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