Jimsonweed
Also known as
Devil's snare, Thorn apple, Jamestown weed, Stinkweed, Devil's trumpet
Keep this plant’s care guide close at hand.
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Datura stramonium, commonly called jimsonweed, is a fast-growing annual in the nightshade family. Erect, branching plants reach 0.5–1.5 m, bearing large, coarsely toothed, ovate leaves and showy, trumpet-shaped, white to pale violet flowers that open toward evening and emit a sweet scent to attract night pollinators. After flowering, spiny, golf-ball-sized capsules develop, splitting to release numerous black seeds. A classic ruderal species, it thrives in warm, disturbed, nitrogen-rich soils, from roadsides to farm fields. Although sometimes cultivated for its striking blooms, it self-seeds prolifically and can be invasive. All parts contain potent tropane alkaloids (atropine, hyoscyamine, scopolamine) that can cause severe, even fatal, poisoning; handling with care is essential. It prefers full sun, moderate water, and well-drained, neutral to slightly alkaline substrates. In temperate climates it dies with frost but readily reappears from seed. Native to the Americas and now naturalized worldwide, it has a long, complex ethnobotanical history, but intentional ingestion is extremely dangerous.
Taxonomy
Properties & Requirements
How to care for Jimsonweed
Water
Water deeply but infrequently to encourage a robust taproot. In-ground plants generally need only rainfall once established; irrigate during prolonged droughts to prevent wilting. For containers, let the top 2–3 cm (about 1 inch) of mix dry slightly between waterings. Avoid waterlogging, which promotes root rot, yet don’t let seedlings dry out during their first few weeks. Morning watering, mulch, and freely draining soil help maintain even moisture during summer heat.
Light
Provide full sun for 6–8+ hours daily to maximize flowering and compact growth. Plants tolerate light, open shade but will produce fewer blooms and may stretch. In very hot, arid climates, a touch of afternoon shade can reduce leaf scorch without markedly reducing performance. Indoors (not recommended due to toxicity), place in a bright south- or west-facing window with good air movement. Avoid deep shade and overcrowded plantings.
Nutrients
As a vigorous ruderal annual, jimsonweed rarely needs heavy feeding. Mix compost into planting soil, or use a slow-release, balanced granular fertilizer at planting. For container-grown plants, apply a half-strength, balanced liquid feed (e.g., 10-10-10) monthly during active growth. Avoid high nitrogen, which encourages lush foliage at the expense of flowers and can increase pest susceptibility. Do not fertilize after late summer, and skip feeding entirely on fertile ground.
Temperature
Jimsonweed is a warm-season annual. Germination and growth are best with days at 20–30°C (68–86°F) and nights above 12°C (54°F). It is highly frost sensitive; even light frost will blacken foliage and end the season. In hot climates it tolerates brief heat spikes to the mid-30s°C (mid-90s°F) if soil moisture is adequate. Start seeds outdoors after all frost risk, or pre-start indoors 4–6 weeks early and harden off carefully.
