Hoary Alyssum


  • “Hoary” silver color from short, star-shaped hairs covering entire plant
  • Grayish-colored leaves with  smooth to wavy edges
  • Sandpaper-like leaf texture
  • Small 4-petal white flower with notched petal tips giving the appearance of rabbit ears
  • Height 1 to 3 feet

Weed Pictures

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Weed Information

ToxicityHorses, even when cured in hay.
ControlShallow tilling, digging/hand pulling the root crown, prescribed burning and herbicide. Contact your County Weed District or local Applicator for more information.
HabitatDry conditions, soils with poor soil fertility, distrubed areas, trails, roadsides, lawns, farm yards, hay meadows and over-grazed pastures.
Leaf ShapeLinear, alternate on stem.
LifespanAnnual or perennial.
Priority 2B WeedAbundant in Montana and widespread in many counties.
Similar Looking PlantsWhitetop or perennial pepperweed.
Important InformationReproduction from seed only; viable in the soil for up to nine years.