Hoary Cress · Cardaria draba
(L.) Desv. · (aka
whitetop, whiteweed, and perennial peppergrass) is a perennial Forb
that originated in Eurasia. It flowers from April through June, and
reproduces through rhizomes and seeds.
Found in pastures, smallgrain fields, roadsides, ravines, meadows, and
waste places, livestock will graze hoary cress, but only when better
forage is unavailable. Its seed are eaten by ground-foraging birds. The
foilage of hoary cress contains a substance causing irritation to mucous
membranes of animals. It is only a problem when forage is in short
Hoary cress is an aggressive weed that often forms large, dense stands which are difficult to eradicate or control.