St. Johnswort

QUICK IDENTIFICATION

  • Numerous, rust colored stems at base of plant
  • Pale to yellow-green leaves with small transparent dots
  • Bright yellow, 5-petaled flowers with tiny black dots visible when held up to light; prominent stamens
  • Height of 1 to 3 feet

Video Information


Weed Pictures



Weed Information


Type Information
Toxicity Toxic to humans and livestock
Control Hand pulling/digging, mowing, biological and herbicide. Contact your county weed district or local applicator for more information.
Habitat Pastures, waste areas, roadsides and sandy, gravelly soil.
Root Extensive, deep root system
Leaf Shape Linar or oblong with rounded or pointed tips
Lifespan Perennial; two years or longer.
Priority 2B Weed Abundant in Montana and widespread in many counties.
Similar Looking Plants Ornamental St. Johnswort and tansy ragwort
Important Information Plant contains a toxic substance which causes skin sores/rash and sun sensitivity in humans and animals. This plant is purported to have numerous medicinal properties.
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