How to Prune lion's tail?
Shorten flowered shoots to about 1.5–2.5 cm from the previous year's growth. If flowering is on last year's growth, prune after flowering; if on current-year growth, prune the following early to mid-spring.

lion's tail · Leonotis leonurus
Also known as: lion's tooth; lion's ear
Treat as a tender perennial and grow in a cool greenhouse, or plant outdoors after frosts in a sunny border or against a warm wall
Shorten flowered shoots to about 1.5–2.5 cm from the previous year's growth. If flowering is on last year's growth, prune after flowering; if on current-year growth, prune the following early to mid-spring.