Text Size
Increase text size
Increase text size

Weed Control



Black henbane (Hyoscyamus niger) is a Mediterranean native that was introduced as an ornamental and medicinal plant in the 17th century. It spreads by seeds and is found in a variety or environmental conditions. Black henbane is narcotic and poisonous to humans. Livestock avoid it unless other forage is not available. Two alkaloids in black henbane tissues (hyoscyamine and scopolamine) are useful sedative/ anti-spasmodic drugs when used under controlled conditions.

Black Henbane
Black Hembane  

Black henbane is an annual plant that germinates, flowers, seeds, and dies during one growing season or a biennial plant that germinates in one growing season, then flowers, seeds, and dies during a second plant that grows up to 3 feet tall. The entire plant is covered with greasy hairs. Leaves are up to 8 inches long and 6 inches wide, shallow lobed cut into a leaf from the edge toward the center; greater than toothed, but not quite compound, and heavy scented. Flowers are borne on spikes narrow, nonspreading inflorescence form the leaf axils from May until September. They are showy, 5 lobed, up to 2 inches across, and greenish-yellow in color with deep purple veins and throats. The calyx, the outermost flower leaves (sepals) together, often green in color forms a 1-inch, urn-shaped "fruit" that has a thickened lid that pops off at maturity and spills the black seeds


 Black Hembane4



  Weed Control Map pdf file