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Perennial Pepperweed (Lepidium latifolium) is native to southern Europe and western Asia. Here in the west, it is also refered to as Broad-Leaved Peppergrass and Tall Whitetop. A number of states have declared it noxious. Perennial Pepperweed grows in waste areas, wet ground, ditches, roadsides and some croplands. In Weber County, we have trouble with it in exactly that type of location. This particular weed grows up to six feet tall and is known for its showy, delicate flowers. Our State Agricultural Inspector often finds Perennial Pepperweed included in dry flower arrangements.
weeds

The Perennial Pepperweed has basal leaves that are lance shaped, have long petioles, are up to 12 inches long, and are covered with a waxy layer. Stem leaves are smaller and have shorter petioles, but don't clasp the stem. Leaves have a prominent, whitish midvein. Flowers are white, less than 1/8 inch wide, and are borne in dense, rounded clusters at the branch tips from early summer until fall. Fruits are roundish, slightly hairy, measure 1/16 inch in diameter, and contain 2 tiny seeds.

Perennial Pepperweed is difficult to control due to its stout root system, but up to date chemicals and methods mentioned in the Weed Control Guide can help.