Japanese Mugwort prefers consistently moist soil but can tolerate some drought once established. Water deeply when the top inch of soil feels dry. Avoid waterlogging, which can lead to root rot.

Reduce watering slightly during winter months when the plant's growth slows.

Prune Japanese Mugwort in late spring or early summer to encourage bushier growth and prevent it from becoming leggy. Deadhead spent flowers to prevent self-seeding.

In late autumn, cut back the entire plant to the ground to tidy up the garden and prepare it for winter.

Japanese Mugwort is easily propagated by division in early spring or autumn. Simply dig up a mature clump and separate it into smaller sections, ensuring each piece has roots and a few shoots.

It can also be propagated from stem cuttings taken in early summer.

Repotting is rarely necessary for Japanese Mugwort, as it is often grown in the ground and can become quite vigorous. If grown in a container, repot every 2-3 years in early spring into a slightly larger pot with fresh, well-draining potting mix to refresh the soil.