African rue was introduced to the United States in 1931. These weeds are primarily problems in degraded rangeland habitats or waste areas along roadsides. Both exhibit a bushy appearance and die back to the crown each winter. New shoots arise from the crown or lateral roots and extend in a radial fashion from the main taproot. Both species are generally unpalatable to livestock and African rue has been reported to be highly toxic to cattle, sheep, and horses.
Mechanical removal is a difficult task for either species.
The strong, deep taproot and lateral roots must be removed for control. Plants may be cut back to the crown, but regrowth will occur. Tillage will only serve to spread infestations by severing and dragging rootstocks to new areas. Longevity in the seed bank for both species is unknown. Grazing is not an effective control option, due to non-palatability or toxic effects.