Valerian

The sleep-root caveat

Valerian is grown for a root that has a pungent, earthy smell — attractive to cats and off-putting to some gardeners. The root is lifted after two or three seasons, washed and sliced. The plant itself is easy; the safety question is not.

NCCIH describes valerian as generally safe for short-term use in most adults, but notes side effects such as headache, stomach upset, mental dullness and vivid dreams, and warns against combining it with alcohol or sedatives (NCCIH). It is not a casual bedtime tea if you drive, operate machinery or take other sedatives.

Growing it

PFAF gives USDA zone 4–8 and describes valerian on grassland, scrub and woodland edges, on dry or damp soils (PFAF). In a garden it prefers moist, fertile ground and sun or partial shade. It tolerates a range of soils but not a waterlogged crown in winter.

Sow seed in spring or autumn, or divide an established clump. The plant self-sows readily; remove flower heads if you do not want it to move around. Tall stems may need staking in exposed sites. Cut back after flowering to keep the clump tidy.

Harvest and drying

Lift roots in autumn of the second or third year, after the foliage dies back. The root mass is fibrous and tangled, so fork widely and wash it thoroughly. Cut the roots into slices or short pieces; the smell is strong, so work in a ventilated space.

Dry at the lowest setting of a dehydrator, or in a warm, airy room, until the pieces are brittle. Store airtight in the dark; the aroma fades over time. Keep the dried root labelled — it is not interchangeable with other roots.

1. Cut back the stems after autumn die-back.
2. Fork widely and lift the root mass.
3. Wash and slice while fresh.
4. Dry at low heat; store airtight.

Identifying it

Valerian has opposite, pinnate leaves with lance-shaped leaflets and clusters of small white to pink flowers in summer. The root is a tangled mass of pale, aromatic roots. The scent is the strongest confirmation when the root is cut.

It is not a carrot-family plant, despite the umbel-like flower heads. Still, do not harvest an unknown root from a mixed meadow; grow named plants and keep the label with the dried root.

Traditional context

Valerian has a long European history as a calming and sleep-related herb. NCCIH notes that research is limited and that long-term safety is unknown; it also warns about rare liver injury, mostly in combination with other herbals.

This page covers growing and handling. It gives no dose or treatment plan, and anyone who is pregnant, breastfeeding, driving, or taking sedatives or other medicines should speak to a clinician before using the root.