How to Prune wormwood?
For colourful stems or large foliage, prune hard to a low framework. Let young plants establish for one to two years first. Prune in late winter or spring, before or as new growth starts.

wormwood · Artemisia absinthium
Also known as: absinth; absinthe; common wormwood; girdle of St John; green ginger; holy seed; lad's love; mingwort; old man; old woman; St John's girdle; warmot
Grow in fertile well-drained soil in sun. Can die back in heavy, poorly-drained soil
For colourful stems or large foliage, prune hard to a low framework. Let young plants establish for one to two years first. Prune in late winter or spring, before or as new growth starts.