St. John's Wort (Hypericum perforatum)

St. John's Wort is a perennial herb. It will grow to be 1-3' tall. It has been introduced to many temperate areas of the world and grows wild in meadows mostly.

Leaves: Leaves are oblong in shape and yellow-green in color. they have transparent dots and sometimes black dots on the lower surface.

Flowers: It's 5 petaled yellow flower will apear at the ends of the upper branches between late spring and early to mid summer.

Fruits & Seeds: There is a 3 celled capsule containing small dark brown seeds.

Roots: Has a woody branched root system.

Ecological threats

  • It will replace native plants and forage vegetation to the extent of making productive land unviable
  • Ingestion by livestock can cause photosensitization, central nervous system depression, spontaneous abortion, and can eventually lead to deathstjohnswort1.jpg   stjohnswort2.jpg