Background: Native to southern Europe and western Asia, tall whitetop is commonly found in wet drainage areas of waste area, ditches, roadsides, and crop lands.
Other common names: Perennial pepperweed, broadleaved peppergrass
Description: Tall whitetop grows from one to six feet high. It has spreading, lateral rootstocks. Leaves have smooth to lightly toothed margins. Stems and leaves are waxy. White flowers form dense clusters at the end of branches. Flowering takes place from summer into early fall.
Control: Biocontrol research is in early stages. Select herbicides can offer fair to good control when applied to actively growing plants up to pre-bloom. Contact your local state or county weed specialist for specific updated information.