How to Prune Chilean jasmine?
On established plants, shorten sideshoots to three or four buds from the permanent framework; remove crowded or damaged shoots. Prune in late winter or early spring.

Chilean jasmine · Mandevilla laxa
Grow in a temperate or warm greenhouse or conservatory in loam-based compost in full light but with shade from hot sun. Young plants can be grown in pots to stand outside in summer. Usually evergreen, but will drop leaves if too cold in winter
On established plants, shorten sideshoots to three or four buds from the permanent framework; remove crowded or damaged shoots. Prune in late winter or early spring.