Marsh Hedgenettle thrives in consistently moist conditions. Water regularly to keep the soil damp, especially during dry spells.

Avoid waterlogged conditions, but do not allow the soil to dry out completely, as this can stress the plant. Aim for even moisture throughout the growing season.

Prune Marsh Hedgenettle to maintain its shape and encourage bushier growth. Deadhead spent flowers to prevent self-seeding if desired. Cut back stems in late autumn or early spring to remove dead or overgrown material.

This also helps in tidying up the plant.

Propagate Marsh Hedgenettle through stem cuttings taken in spring or early summer. Root the cuttings in moist potting mix or water. It can also be propagated by division of established clumps in spring.

Seed propagation is also possible, but cuttings offer faster results.

Repot Marsh Hedgenettle if it becomes root-bound or outgrows its container. This is typically done in spring before new growth begins. Choose a pot that is slightly larger than the current one.

Use a well-draining potting mix, as the plant prefers moist but not soggy soil.