White HorehoundMarrubium vulgare

Horehound is drought-tolerant once established. Water deeply but infrequently, allowing the soil to dry out completely between waterings to prevent root rot.

Young plants require more consistent moisture for proper establishment. Reduce watering significantly in cooler months or if grown in containers to avoid waterlogging.

Prune horehound to maintain its shape, encourage bushier growth, and prevent it from becoming leggy. Cut back spent flower stalks to promote a tidier appearance and prevent excessive self-seeding.

A more significant cutback in late autumn or early spring can rejuvenate older plants and remove any dead or woody stems.

Horehound is easily propagated from seeds, which can be sown directly outdoors in spring or autumn.

It can also be propagated by stem cuttings taken in late spring or early summer, rooting readily in a moist, well-draining medium.

Division of established clumps in spring or autumn is another effective method, ensuring each division has a good root system.

Horehound grown in containers will eventually need repotting every 1-2 years, or when it becomes root-bound. Choose a pot only slightly larger than the previous one to avoid excess moisture retention.

Use a well-draining potting mix. Repot in early spring before new growth begins, gently loosening roots if necessary to encourage new growth.