Keep the soil consistently moist, especially during dry spells. Valerian prefers regular watering and can tolerate slightly boggy conditions. Avoid letting the soil completely dry out, as this can stress the plant.

Water at the base of the plant to prevent fungal issues on the foliage.

After flowering, deadhead spent flower stalks to prevent self-seeding and encourage a tidier appearance. In late autumn or early spring, cut back the dead foliage to the ground.

This helps prevent disease and stimulates fresh growth for the upcoming season.

Valerian can be propagated by seed, sown in autumn or early spring. Division of established clumps in spring or autumn is another effective method.

Sow seeds thinly in trays filled with moist seed compost and keep them in a cool, shaded location.

Established Valerian plants are best left undisturbed as they can become quite large.

If container-grown plants become root-bound, repot in spring into a slightly larger container using good quality, well-draining potting mix. Avoid frequent repotting, as they prefer to establish a strong root system.