Jimsonweed (Datura stramonium) - How to Grow & Care Guide

Plant Snapshot

Common Name: Jimsonweed
Latin Name: Datura stramonium
Hardiness Zones: Often grown as an annual in colder USDA zones and persistent where winters are mild. May survive or regrow in frost free zones.
Typical Height: 1–5 ft (30–150 cm).
Typical Spread: 1–3 ft (30–90 cm) or wider from self seeding.
Bloom Period: Summer to early fall (Northern Hemisphere Jun–Sep).
Soil Preferences: Well drained soils preferred. Tolerates poor and dry soils. Avoid waterlogged sites which cause root decline.
Light Preferences: Full sun to part shade. Best flowering in full sun.
Toxicity: All parts are poisonous to humans and animals. Contains tropane alkaloids that can cause severe anticholinergic poisoning if ingested. Avoid handling seed pods and wear gloves when removing plants.
Propagation: Primarily by seed. Plants readily self seed. Start seed indoors or sow direct in spring after frost.

Key Facts

Annual or short lived perennial herb typically 1–5 ft (30–150 cm) tall.
Large trumpet shaped white to pale purple flowers that open in the evening.
Produces a spiny capsule fruit filled with many seeds.
Readily self seeds and can behave as a weedy volunteer in disturbed soil.
All plant parts contain tropane alkaloids and are toxic if ingested.
Flowers appear in summer to early fall in temperate climates.
Prefers well drained soil and tolerates poor, dry soils.
Performs best in full sun to part shade.

Jimsonweed is a self seeding herb with large evening trumpet flowers and spiny seed capsules. It can make a dramatic annual specimen in sunny, disturbed spots but all parts are toxic and plants spread readily by seed.

Identification

Plants usually reach 1 to 5 feet tall and produce large white to pale purple trumpet shaped flowers that open in the evening. Fruit are spiny capsules that split to release many seeds. The species is an annual or a short lived perennial depending on local winter severity.

Where to grow and common uses

Grow in a sunny to part shade border or a naturalized area where volunteers are acceptable. Jimsonweed performs well in well drained, poor or dry soils and blooms in summer into early fall in temperate climates. Avoid planting near play areas or where children and pets might encounter the plant due to its toxicity.

Planting and seasonal timing

Sow seed indoors before last frost or direct sow after frost has passed. Space plants about 1 to 3 feet apart to allow for mature spread. Flowers typically appear from summer into early fall in the Northern Hemisphere.

Water and soil

Plants prefer well drained soil and tolerate dry conditions. Regular watering while plants establish will help growth. Do not leave plants in waterlogged soil as root decline can occur.

After flowering and seed control

Seed capsules contain many viable seeds and promote rapid natural reseeding. Remove and destroy capsules before they open to limit spread. Wear gloves when handling pods and plant material and do not add ripe seed heads to compost.

Controlling volunteers

Young plants are easiest to remove by pulling before they set seed. Monitor borders and disturbed soil for volunteer seedlings. Persistent stands expand mainly by seed so reducing seed production is the most effective long term control.

Propagation

Propagate by seed. Plants readily self seed so new plants commonly appear the following season where seeds were allowed to mature.

Toxicity and safety

All parts of the plant are poisonous to humans and animals. Jimsonweed contains tropane alkaloids that can cause severe anticholinergic effects if ingested. Keep plants away from livestock, pets and children. Wear gloves when removing plants or seed capsules and consult local poison control for exposure guidance.

Frequently asked questions

How fast does Jimsonweed grow?: Seedlings can grow quickly and plants often reach their typical 1 to 5 foot height within a single growing season in favorable conditions.
Is Jimsonweed invasive?: The plant readily self seeds and can behave as a weedy volunteer in disturbed soil. Manage by removing seed heads and pulling volunteers.
When does Jimsonweed bloom?: Flowers appear in summer into early fall in temperate climates, typically from June to September in the Northern Hemisphere.
Can I keep Jimsonweed where I have pets?: No. All parts are toxic to dogs, cats and livestock. Avoid planting where animals can graze or access plant material.
How do I stop it from reseeding?: Remove seed capsules before they split, pull seedlings and dispose of mature seed heads in the trash rather than in compost.