How to Prune Berzelia intermedia?
Unless seed is required, deadhead and prune lightly after flowering, to keep in shape

Berzelia intermedia · Berzelia intermedia
Grows well in moist but free draining soil, rich in organic matter, in full sun or semi-shade. They need to be kept almost dry over winter, container grown plants are easier to protect from the worst of the winter cold and wet
Unless seed is required, deadhead and prune lightly after flowering, to keep in shape