Jimsonweed | The Morton Arboretum

Jimsonweed is a dangerous plant that is harmful when ingested. This plant spreads by seed. It commonly grows in open fields and disturbed areas. It is thought to be native to Asia, but some literature indicates it may be native to tropical America. Today it is found throughout the United States. The plant is highly toxic to both humans and livestock. It causes a wide range of symptoms including blurred vision, nausea, heart palpitations, slower cognitive functioning, hallucinations, and in extreme cases, loss of consciousness or death.

As an alternative, wild petunia (Ruellia humilis) is a good option that is native to Illinois. There are a number of native and non-native species that could be used in place of jimsonweed. More desirable species may be found using the online Search Trees and Plants page of the Arboretum website. Before purchasing or planting, be sure to check for any local or state guidelines on this species, and ensure that this plant is suitable for its habitat by checking its attributes at mortonarb.org or plants.usda.gov.

More Information

Size and Method of Spreading

Jimsonweed ranges in height from 1 to 5 feet tall. It is an upright plant with sturdy, branched stems that may be green or purple.

Leaf Description

Jimsonweed’s simple, alternate leaves are dark green. The leaf edges (margins) are coarsely and sharply toothed and lobed. The tip of the leaf is tapered to a sharp point (acuminate). The leaves are 3 to 6 inches long, and 3 to 4 inches wide. When broken, the leaves produce a rank odor.

Flower Description

The flowers of jimsonweed are bright white with a deep purple hue in the center. The flower is about 4 inches long, having a tight funnel shape towards the base, and expanding to five to six larger petals (funnelform). Each petal has a small fold on the edge, giving it a strongly angled look. Flowers are produced throughout summer and into early fall.