Jimsonweed, Datura stramonium. Photo: Jan Samanek, Phytosanitary Administration, Bugwood.org
Jimsonweed (Datura stramonium) grows in landscape beds or open and undisturbed areas. If left alone, it has the potential to be the tallest unwanted plant in the landscape bed. Jimsonweed can reach a height of over 5 feet. Reproduction is by seeds, which are borne in a spikey, egg-shaped pod. The pods have four chambers once they open and hang on the stalks during the winter. The leaves have an alternate arrangement.
Older leaves have some indentations (teeth), but they are not pronounced. Mature leaves can be 6 inches in length. The foliage has an unpleasant odor if crushed. The stems of mature plants are a mix of green and purple colors. Jimsonweed flowers are white-purple, funnel-shaped and can be up to 4 inches long. One unique characteristic about Jimsonweed is that all parts of the plant are poisonous to animals and humans. It has been ingested in various forms as a hallucinogenic drug, but the alkaloids are extremely dangerous and should not be consumed.
Jimsonweed produces a branched taproot, which makes hand-removal of larger plants challenging. Seedlings can be hand removed. Pre-emergent herbicides for Jimsonweed: flumioxazin (BroadStar/SureGuard) and oxyfluorfen (Goal 2XL, nursery only). Post-emergent herbicides include: clopyralid (Lontrel), glufosinate-ammonium (Finale, non-selective), glyphosate (Roundup, non-selective) and oxyfluorfen (Goal 2XL). As with any pesticide application, read the label for specific usage information.