How to Prune Greek horehound?
Shorten flowered shoots to about 1.5–2.5 cm from the previous year's growth. Prune in mid-spring.

Greek horehound · Pseudodictamnus acetabulosus
Grow in poor, dry, well-drained soil in full sun or use as a drought-tolerant plant for a raised bed
Shorten flowered shoots to about 1.5–2.5 cm from the previous year's growth. Prune in mid-spring.