To keep the plant shaped and flowering, Caryopteris plants should be cut down by at least half in the early spring. You can cut them back to 12 to 18 inches without harm. ... If the plants die back in winter, remove the dead stalks in spring as new growth is beginning.

How do you prune Caryopteris?

Garden care: In March prune all of the flowered stems back hard to the permanent framework. After pruning apply a generous 5-7cm (2-3in) mulch of well-rotted garden compost around the base of the plant.

How do you prune Caryopteris UK?

Caryopteris bloom on the current year's growth, so are well-suited to some hard pruning in spring, to encourage vigorous new growth and keep them looking tidy, for masses of autumn flowers. Do this by cutting down last year's growth, to buds held on the old, woody growth.