How to Prune potato vine?
On established plants, shorten sideshoots to three or four buds from the permanent framework; remove crowded or damaged shoots. Prune after flowering has finished.

potato vine · Solanum laxum
Also known as: Japanese nightshade; jasmine nightshade
Grow outdoors in moist but well-drained, neutral to slightly alkaline soil in full sun; well-suited to growing against a sunny wall. Grow under glass in loam-based compost in full light shaded from hot sun, or bright indirect light. Support plants and tie in regularly
On established plants, shorten sideshoots to three or four buds from the permanent framework; remove crowded or damaged shoots. Prune after flowering has finished.