Wild radish
Also known as
Jointed charlock, White charlock, Sea radish, Runch
Keep this plant’s care guide close at hand.
Get the appAbout Wild radish
Raphanus raphanistrum, commonly called wild radish, is a hardy annual or short-lived biennial in the mustard family (Brassicaceae), native to the Mediterranean but now naturalized on most continents. It forms a basal rosette of rough, pinnately lobed leaves with bristly hairs, and erect, branched stems 20–80 cm tall. Showy four-petaled flowers range from creamy white to pale yellow or lilac with purple veins, followed by unmistakable jointed, beaded seed pods (siliques) that break into segments when ripe. Blooming peaks in cool seasons, and flowers attract bees and other pollinators. The species thrives in disturbed soils—field margins, pastures, roadsides, and coastal dunes—and tolerates wind, sandy soils, and light salt spray. While young leaves and pods are edible and peppery, the seeds and mature plants can be harmful to livestock if consumed in quantity. It self-seeds readily and can become invasive if not managed. Deep taproots confer drought resilience, and the plant adapts to a wide range of soils from sandy to loamy, slightly acidic to neutral.
Taxonomy
Properties & Requirements
How to care for Wild radish
Water
Water to establish, keeping soil evenly moist for the first 2–3 weeks. Thereafter, plants tolerate dry spells; in sandy soils aim for about 2.5 cm of water per week from rain or irrigation during active growth. In containers, water when the top 2–3 cm of mix is dry; irrigate thoroughly until excess drains, then empty saucers. Avoid persistent waterlogging, which can cause root issues. Morning watering helps reduce foliar disease and limits unwanted spread.
Light
Prefers full sun (6+ hours) for compact growth and abundant flowering, but tolerates light shade, especially in warmer climates. In coastal sites it endures wind and moderate salt spray. In very hot regions, provide afternoon shade to extend bloom and reduce stress. Insufficient light results in lanky stems and fewer flowers. Indoor cultivation is not recommended; if attempted, use the brightest exposure or supplemental grow lights.
Nutrients
Wild radish needs little to no fertilizer in open ground. On very poor soils, mix in light compost or a slow-release, balanced fertilizer at planting. Avoid high nitrogen, which promotes rank leaf growth and heavy seeding. In containers, a single half-strength dose of a balanced, low-N product (e.g., 5-10-10) after establishment is sufficient; further feeding is rarely needed. Excess nutrients increase vigor and complicate control.
Temperature
Germinates and grows best in cool conditions (10–20°C). Actively grows and flowers between about 5–24°C and tolerates light frost to roughly −3°C once established. Heat above 28–30°C reduces flowering and hastens seed set; plants may senesce quickly in midsummer. In cold regions, autumn-sown rosettes can overwinter and bolt in spring. For containers, buffer extremes with afternoon shade and steady moisture during hot spells.
