Valerian Plant Medicinal Uses: Nature's Remedy from Valeriana Officinalis

Valerian (Valeriana officinalis) is a flowering perennial herb whose roots and rhizomes have been used in medicine since ancient times, valued today chiefly as a calming agent for sleeplessness and nervous tension. The plant grows wild but sparingly along forest edges, in clearings, on the banks of rivers and lakes, in scrub thickets, and near marshes across Europe and Asia.

What is valerian and what does the plant look like?

Valerian (Valeriana officinalis L.) is a tall herbaceous perennial whose botanical name comes from the Latin valere, "to be strong" or "to be well," a reference to its long medicinal reputation. The species belongs to the honeysuckle family, Caprifoliaceae (it was formerly placed in its own family, Valerianaceae). Several subspecies and geographic forms occur across its range, varying slightly in leaf shape and root yield.

Common and botanical names of valerian

Valerian carries many common names, including garden valerian, garden heliotrope, all-heal, and setwall, while its accepted scientific name is Valeriana officinalis. The label "valerian root" refers specifically to the dried underground parts — the roots and rhizome — that supply the active compounds, and it is the term most often seen on supplement packaging.

Appearance and identification of valerian

Valerian reaches up to two metres in height, with erect, branched stems that are ribbed in the upper part, smooth, and hollow inside. The leaves are opposite and pinnately divided into narrow, elongated leaflets; lower leaves sit on long petioles, while upper leaves are nearly stalkless. This combination of hollow grooved stems, paired divided leaves, and a strong-smelling root makes the plant straightforward to distinguish from look-alikes.

Flowers, colour, and flowering season

Valerian produces small, funnel-shaped, pale lilac to white flowers gathered into loose, rounded clusters with no fixed outline, blooming in May and June. The dense flower heads are mildly fragrant and rich in nectar, drawing a wide range of pollinators, including bees, butterflies, and hoverflies such as Eristalis. For this reason valerian is often planted in borders and wildlife gardens as a nectar source, and its airy height suits the back of a mixed perennial bed.

The root system of valerian

The root system of valerian consists of a short, cylindrical brown rhizome from which numerous thin, long, cord-like roots of a dingy yellowish-white colour radiate. Freshly dug valerian roots cannot be mistaken for any other plant because of their sharp, distinctive "valerian" smell. A single mature plant typically yields a handful of roots that are washed and dried for medicinal use.

The characteristic aroma and scent of valerian

Valerian root develops its famously pungent, earthy, slightly sour odour as it dries, an effect caused by isovaleric acid forming in the cured root. Curiously, the smell that many people find unpleasant is strongly attractive to cats, much like catnip, and the scent has long been woven into folklore — one legend holds that the Pied Piper of Hamelin carried valerian to charm the rats.

Where does valerian grow: distribution and habitat?

Valerian is native to Europe and parts of western Asia and has since become naturalised across temperate regions, including North America. In the United States and Canada it grows in damp meadows, ditches, and woodland margins, and in some northern areas — parts of the Northern USA, Wisconsin, and Connecticut among them — it spreads readily enough to be treated as a potentially invasive escape from cultivation. Its preference for moist, cool habitats explains why it thrives near water and in the dappled light of forest edges.

The history of valerian in ancient medicine

Valerian has been used medicinally for more than two thousand years, with the Greek physicians Hippocrates and later Galen recommending it for insomnia and nervous complaints. During the Renaissance, herbalists such as John Gerard and Nicholas Culpeper documented valerian for cramps, tension, and headaches, cementing its place in European folk medicine. This long record of traditional use is one reason the herb remained popular even before modern clinical study began.

Chemical composition of the roots and rhizomes

The roots and rhizomes of valerian contain essential oil, valerenic acid, valeric acid, active alkaloids, tannins, and other constituents. The compounds most studied for sedative activity are the sesquiterpenes — valerenic acid, acetoxyvalerenic acid, and valerenal — alongside the volatile oil. Valerenic acid is generally regarded as the principal active compound linked to valerian's anxiety-reducing and calming effects, although the herb's action is thought to arise from the combined contribution of several constituents rather than any single one.

The medicinal properties of valerian

The pharmacological activity of the compounds in valerian root is high, and this is the basis of valerian's medicinal properties. Decoctions and preparations made from valerian root have a calming effect, ease muscle spasms, help regulate the work of the heart, and support circulation and the gastrointestinal tract. The roots are the plant part used medicinally.

Calming action in anxiety, stress, and depression

Valerian root is most widely used to reduce nervous anxiety, ease everyday stress, and promote relaxation, and it is sometimes taken to support low mood associated with tension. The leading explanation for its mechanism is that valerenic acid influences GABA, the brain's main calming neurotransmitter, in a manner loosely comparable to how benzodiazepines work, though far milder. Evidence for valerian in clinical anxiety and depression remains limited and mixed, so it is best viewed as a gentle support rather than a treatment for diagnosed disorders.

Effectiveness for insomnia and sleep problems

Valerian root is best known as a traditional sleep aid, taken to shorten the time needed to fall asleep and to improve perceived sleep quality. Reviews summarised by the National Center for Complementary and Integrative Health and discussed on consumer health sites such as WebMD report inconsistent results: some people experience benefit while controlled trials show modest and uneven effects, and the American Academy of Sleep Medicine does not recommend it as a first-line therapy for chronic insomnia. The honest position is that valerian may help some individuals with mild sleeplessness, but the evidence base has notable gaps.

Antispasmodic properties for cramps and spasms

Valerian root has long been used as an antispasmodic to relax smooth muscle and relieve cramps, including menstrual and digestive spasms. This action underlies its traditional reputation for easing tension-related stomach upset and contributes to its use for some symptoms of premenstrual syndrome. Germany's Commission E historically approved valerian preparations for restlessness and nervous-related sleep disturbance, reflecting this combined calming and relaxing effect.

Current promoted uses of valerian

Today valerian is promoted chiefly for insomnia, nervous anxiety, and stress, with secondary use for menopausal hot flashes, premenstrual symptoms, and mild pain relief. The European Medicines Agency recognises valerian as a traditional herbal medicinal product for the relief of mild nervous tension and sleep difficulties. As with many herbal remedies, marketed claims often outpace the strength of the supporting research.

How valerian is used in medicine

Valerian is taken in several standardised forms, and a herbal-medicine source such as Steven Foster's field guides describes both the traditional decoction and modern extracts. Choosing a product, dose, and duration is best discussed with a clinician, especially for ongoing sleep or anxiety concerns.

Dosage recommendations and duration of use

Valerian is usually taken in modest amounts shortly before bedtime, with typical sleep doses ranging from about 300 to 600 mg of root extract, or a cup of tea made from roughly 2–3 grams of dried root. It is generally regarded as safe for short-term use of a few weeks, and continuous long-term use is not recommended without medical advice. Reviewers such as the registered dietitian Christine Mikstas, RD, LD have noted on consumer health platforms that effects can take a couple of weeks of regular use to appear.

Available forms and preparing decoctions

Valerian is sold as dried root, capsules, tablets, liquid tinctures, and tea bags, and you can find these supplements at pharmacies, health-food shops, and online retailers. To prepare valerian, the available forms include:

• Tea: steep 2–3 g of dried, chopped root in hot water for 10–15 minutes, then strain.
• Decoction: simmer the roots gently in water to extract the active compounds, then strain and drink warm.
• Tincture: follow the dose on the label, diluted in a little water.
• Capsules or tablets: standardised extracts offering a consistent amount of valerenic acid.

Herbs that combine well with valerian in blends

Valerian is frequently blended with other calming herbs to round out its taste and effect, most commonly lemon balm and catnip, both of which complement its sedative profile. Greek basil and other aromatic herbs are sometimes added to improve the flavour of teas. These combinations are popular precisely because valerian's strong odour and taste benefit from gentler herbal partners.

Precautions and side effects

Valerian is generally well tolerated for short periods, but it can cause side effects and is not suitable for everyone. Minor side effects of valerian root include drowsiness, headache, dizziness, dry mouth, vivid dreams, and occasional stomach upset. Pregnant and breastfeeding women and young children should avoid valerian because its safety in these groups has not been established, and anyone with liver concerns should be cautious; seek medical attention for any severe or unusual reaction.

Interactions with medicines and supplements

Valerian can interact with drugs and supplements that depress the central nervous system, including sedatives, benzodiazepines, sleep medications, anaesthetics, and alcohol, potentially intensifying drowsiness. Because of these interactions, tell your doctor you are using valerian before any surgery and before combining it with other calming products. As a dietary supplement, valerian is regulated in the United States by the FDA (the U.S. Food and Drug Administration) under the rules for dietary supplements rather than as a drug, which means products are not reviewed for effectiveness before sale and quality can vary between brands.

Risk of dependence and unwanted effects

Valerian is not generally considered strongly addictive, but some people who use it heavily for long stretches report mild withdrawal-like symptoms — such as restlessness or rebound sleeplessness — when they stop abruptly, so tapering off after extended use is sensible. Stopping after only short-term use rarely causes problems. If sleep or anxiety issues persist, that is a signal to consult a clinician rather than to keep increasing the dose.

The effect of valerian on cats

Valerian affects many cats much like catnip, triggering rolling, rubbing, and playful excitement followed by a calm phase, because compounds in the root mimic feline attractant chemicals. Pet-focused resources such as Plants for Pets note that small, occasional exposure is usually harmless to cats, but the plant and concentrated products should be kept out of reach to prevent overindulgence. The same pungent scent that some humans dislike is exactly what draws felines to it.

Culinary and flavouring uses

Valerian has limited culinary use: historically the young leaves were occasionally eaten as a salad green, and extracts of the root have been used in small amounts to flavour certain foods, beverages, and tobacco. The strong, distinctive aroma keeps it from being a mainstream kitchen herb, so most culinary applications are minor and traditional rather than common today. Beyond the table, the fragrant leaves and stems are sometimes offered to cats as an enrichment treat.

Growing valerian

Wild stocks of valerian are limited, but because this valuable plant is undemanding about where it grows, it can be cultivated successfully in home gardens and allotments. The root system of valerian sits close to the soil surface, so weeding with a hoe is best avoided to prevent damaging the roots.

Soil requirements and growing conditions

To ensure steady yields, soil prepared for planting valerian should be light, well-aerated, moisture-retentive, and enriched with fertiliser. Valerian prefers consistently moist ground and tolerates a range of pH, which is why it does well near water in the wild. It grows in full sun to partial shade, though richer flowering and root development usually follow a position with plenty of light.

Climate zones and plant hardiness

Valerian is a hardy perennial suited to USDA hardiness zones roughly 4 through 9, withstanding cold winters once established. Its tolerance of cool, damp conditions makes it reliable across much of the temperate United States, Canada, and Europe. In milder climates it returns year after year; in harsher regions it still overwinters well thanks to its perennial root system.

Sowing seed and caring for valerian

Sowing of seed collected in August and September is done before winter, and if valerian grows to maturity and sets its own seed, it will reward your care and effort with reliable perennial harvests for years. Gardeners can grow valerian as a perennial left in the ground or as an annual lifted at the end of the season for its roots. Practical cultivation tips include:

• Start seed in plug trays for even germination, then transplant young plants once established.
• Space plants about 30–45 cm (12–18 inches) apart to allow the leafy clumps and tall flower stems room to develop.
• Keep the soil moist, especially in dry spells, since valerian dislikes drought.
• Source seed and plugs from reputable suppliers such as Johnny's Selected Seeds, and select named cultivars where consistent root yield matters.

For broader background on raising medicinal and culinary plants, see our guides on herbs and general agriculture.

Growing valerian in containers

Valerian can be grown in large containers, which suits gardeners short on space or those who want to contain its spreading tendency. Use a deep pot to accommodate the root system, a rich and free-draining potting mix, and water frequently, as containers dry out faster than open ground. Container culture also makes it easy to move plants and to lift the whole root mass at harvest.

Resistance to pests and animals in the garden

Valerian is largely trouble-free in the garden and tends to be deer-resistant, partly because of its strong scent, while its flowers actively attract beneficial pollinators. The main disease to watch for is root rot caused by soil-borne fungi such as Phoma sp., which is best prevented by good drainage and avoiding waterlogged soil. Cats may show interest in the plants, so a little protection can help young valerian establish.

Timing of valerian harvest and preparation

For medicinal purposes the roots and rhizomes are gathered in September and October, after the plant has set seed, when the concentration of active compounds in the root is highest. Roots can be harvested at the end of the first year, but two-year-old plants generally produce a heavier, more potent root, so growers weigh the larger yield of older plants against the extra season of cultivation. After lifting, the roots are washed free of soil, the thick rhizomes split if necessary, and the material dried slowly at low temperature to preserve the volatile oil. The collection dates for valerian are given in the calendar for gathering medicinal plants.