Self-heal
Also known as
Heal-all, Allheal, Common self-heal, Woundwort, Carpenter's herb, Brunel
Keep this plant’s care guide close at hand.
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Prunella vulgaris, commonly called self-heal, is a low-growing, rhizomatous perennial in the mint family (Lamiaceae) valued as a resilient groundcover and medicinal herb. It forms dense mats of opposite, oval leaves on square stems, typically 10–30 cm tall. From late spring into autumn, upright spikes carry stacked whorls of tubular, violet-purple flowers with brownish bracts, highly attractive to bees and butterflies. The plant spreads by creeping stems and seed, knitting into lawns, meadows, and border edges with minimal care. It tolerates a wide range of soils and moisture, from moderately dry to seasonally damp, provided drainage is reasonable. Traditionally, its young leaves and flowers have been used fresh in salads or as an herbal tea, and in folk medicine for minor wounds—hence “heal-all.” In gardens, it serves as a pollinator-friendly filler, path-edge softener, or naturalized meadow component, remaining evergreen in mild climates and semi-dormant where winters are cold.
Taxonomy
Properties & Requirements
How to care for Self-heal
Water
Water newly planted self-heal regularly to keep the root zone evenly moist for the first 6–8 weeks. Once established, it tolerates short dry spells but flowers best with consistent moisture. Water deeply, then allow the top 2–3 cm (about 1 inch) of soil to dry before the next soak. In containers, check moisture more often and empty saucers to prevent waterlogging. Morning watering helps reduce foliar disease; avoid chronic sogginess, which can invite root rot.
Light
Adaptable from full sun to partial shade. For the heaviest bloom and tightest growth, aim for at least 4–6 hours of direct sun daily. In hot summer regions, morning sun with afternoon shade prevents heat stress and premature dormancy. Plants tolerate bright dappled shade but may grow looser and produce fewer spikes. Indoors or on patios, provide bright light near a south or west exposure, or supplement with full-spectrum grow lights set to 12–14 hours.
Nutrients
Self-heal is not a heavy feeder. In the ground, a light top-dressing of compost in early spring is usually sufficient. If soil is very poor, apply a balanced, slow-release fertilizer at half rate once in spring to encourage bloom, avoiding high-nitrogen products that promote leafiness over flowers. In containers, feed monthly during active growth with a half-strength balanced liquid (e.g., 10-10-10), and skip fertilizing in winter. Over-fertilization can reduce flowering and make plants floppy.
Temperature
Hardy in USDA zones 3–9, Prunella vulgaris withstands substantial frost and overwinters reliably, remaining evergreen in mild climates. Ideal growing temperatures are 10–27°C (50–80°F). It continues to bloom in cool weather and may slow in extreme heat; above 32°C (90°F), provide extra water and light afternoon shade. Crown and roots tolerate winter lows near −34°C (−30°F) with mulch and good drainage. Avoid prolonged heat combined with drought, which can induce dormancy and reduce flowering.
