Wood Avens
Also known as
Herb Bennet, St. Benedict's Herb, City Avens, Clove Root
Keep this plant’s care guide close at hand.
Get the appAbout Wood Avens
Geum urbanum, commonly called wood avens, is a hardy, rhizomatous perennial of the rose family (Rosaceae) native to much of Europe and western Asia and naturalized elsewhere. It forms a basal rosette of pinnate leaves with a large terminal leaflet and sends up wiry, branching stems bearing small, bright yellow, five-petaled flowers from late spring into summer. Plants typically reach 30–60 cm tall. After flowering, the seedheads develop hooked burrs that readily cling to fur and clothing, aiding dispersal. The roots have a warm, clove-like aroma due to eugenol and have a history of culinary and medicinal use as an astringent. In gardens, G. urbanum is valued as an easy, shade-tolerant ground-layer plant for woodland edges, hedgerows, and naturalistic plantings. It thrives in humus-rich, moderately moist, well-drained soils and tolerates a range of pH from slightly acidic to calcareous. Once established, it is resilient, tolerating periodic dryness and urban conditions, though consistent moisture and partial shade promote the best foliage and flowering.
Taxonomy
Properties & Requirements
How to care for Wood Avens
Water
Keep soil evenly moist during establishment, watering deeply once or twice weekly as needed so the top 2–3 cm of soil dry slightly between waterings. Once established, Geum urbanum tolerates short dry spells, but performs best with consistent moisture, especially in sun. In containers, check more frequently and water when the top 2–4 cm feel dry; ensure free drainage and never allow the pot to sit in water. Avoid prolonged waterlogging, which can induce root decline.
Light
Thrives in partial shade to light shade, replicating its woodland-edge niche. Morning sun with afternoon shade is ideal in most climates. It tolerates full shade with reduced flowering, and can grow in full sun in cool, moist regions if soil does not dry out. Excessive, intense sun combined with drought leads to scorched foliage and abbreviated bloom; conversely, very deep shade yields sparse flowering and lank growth. Aim for dappled light for best results.
Nutrients
Geum urbanum is not a heavy feeder. Incorporate compost or well-rotted leafmould in spring to refresh nutrients and improve soil structure. In poor soils, apply a light, balanced, slow‑release granular fertilizer at half rate once in early spring. Avoid high-nitrogen feeds that encourage soft, floppy growth. Mulch annually with organic matter to maintain moisture, buffer pH, and support soil life; this generally supplies all nutrients the plant requires for steady, healthy growth.
Temperature
Exceptionally cold-hardy, wood avens overwinters in USDA zones roughly 4–8, tolerating freezes well below -20°C when soil is drained. Ideal growing temperatures are cool to mild (10–24°C). In hot summers (>30°C), provide afternoon shade and steady moisture; plants may slow or go semi-dormant, resuming vigor in cooler weather. No special winter protection is needed in-ground; containers benefit from insulating the pot or placing in a sheltered spot to prevent root freeze–thaw.
