Hemlock Water-Dropwort thrives in consistently moist soil. Water regularly to keep the substrate damp, especially during warmer months and dry spells.

Avoid waterlogged conditions which can lead to root rot, but ensure it never dries out completely. Aim for even moisture for optimal growth.

Pruning is primarily for aesthetic purposes or to manage size. Dead or damaged stems should be removed promptly. Trim back overgrown foliage in late winter or early spring before new growth begins.

Deadheading spent flower stalks can prevent unwanted seed dispersal.

Hemlock Water-Dropwort can be propagated by division of established clumps in early spring. Sow seeds in autumn or spring, stratification may be beneficial for germination.

It can also spread readily by rhizomes, effectively propagating itself in suitable damp environments.

Repotting is generally not a frequent requirement for this water-loving plant, especially if grown in its natural habitat.

If container-grown and pot-bound, repot in early spring into a slightly larger container with fresh, moist soil. Ensure good drainage in the new pot.