Species: St. Johnswort (Hypericum perforatum)

Growth Form : Perennial

Key Identifying Characteristics:Leaves are opposite, oval-shaped, with prominent veins and covered with tiny transparent dots. Flowers are yellow, five petaled, and have numerous stamens.

Reproduction: both seed and rhizomes

Seed Longevity : 6-10 years

Native To: Europe

Effective Control Methods: Remove or treat the plant with herbicides before seed production. Check to see if biological control is feasible in your area. Maintain a healthy cover of perennial plants to discourage invasion and spread.

 

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