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Hoary alyssum is an exotic annual to short-lived perennial forb designated as a noxious weed in Montana since 2008. Toxicity to horses has been reported when green or dried forage is contaminated by more than 30 percent. It can proliferate in forage crops, pastures, and rangelands and rapidly fills in areas disturbed or overgrazed. Maintaining healthy stands of vegetation and reseeding after major disturbances are the best ways to prevent establishment. Herbicides are an effective control option, and repeated applications may be necessary to treat plants that emerge throughout the growing season.
Download this booklet from Montana State University Extension.
Tags: Berteroa incana, Hoary Alyssum, white flower