Hoary alyssum (Berteroa incana) is a toxic weed that grows throughout most of the United States, except for California, Arizona and the southeastern states. It has adapted exceptionally well tothe cooler winters and hotter, drier summers of the northern states and Canada.13 Part of the mustard family (Brassicaceae), hoary alyssum is also known as false alyssum, false hairy madwort, healbite or heal bite, hoaryberteroa and hoary false alyssum. A few states, such as Montana, have designated hoary alyssum as a noxious weed, which means that it has the ability to injure crops, livestock, wildlife or people.
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