Native to Eurasia, this plant was introduced to North America and now is found in nearly every state, with the exception of the extreme southeast.
An annual weed reproducing from seeds. It is a very common weed along roadsides, in cultivated fields, in pastures and fields, as well as any disturbed site. A number of its chemical ingredients can cause serious toxic problems in livestock when it is eaten.
Under good growth conditions plants may grow to 6 feet in height. It is a bushy plant with many branches that grow erect or laterally. Most of the stems and branches are covered with soft hairs, and the branches may develop a reddish color as they mature late in the season. Leaves are small, narrow, and lance shaped and are alternate. The tiny flowers grow in short clusters of 3 to 6 flowers, at the ends of the branches, arising from the leaf axils.
Characteristicts Important to Control:
Large plants should be removed, preferably prior to the maturation of their seeds. Chemical control can be effective with a systemic or contact herbicide, and pre-emergent control can be accomplished with the appropriate material.