St. Johnswort can be controlled using an herbicide containing 2,4 -D (found in many broad-leaf herbicides). Foliar applications should be made when plants are actively growing and before flowering. Pay careful attention to label instructions and follow directions closely. · You may know about St. John's wort for medicinal purposes but when you find it spreading throughout your landscape, your main concern will be getting rid of these plants. This article will help. View all Mowing/Cutting: Regular mowing or cutting can help to controlSt. John's wort by preventing it from flowering and producing seeds. However, this method alone will not be entirely effective since the plant can still spread underground through its rhizomes. Mowing should be done consistently and repeatedly. Learn more about How to ControlSt. John's Wort. View plant photos, descriptions, maps, treatment options, and more. Erosion Control: With lateral root growth extending .4–3 in (1–8 cm) below the surface, and taproots extending 2–5 ft deep, St. Johnswort could make a good erosion control plant. · Plants spread by seed and creeping roots. Control: Abundant seed production, long viability of the seeds, and the ability of the roots to produce new plants make common St. Johnswort difficult to control. An agronomist can advise on a crop program to support StJohn’s wortcontrol in arable areas. This can reduce the amount of StJohn’s wort seed in the soil before you sow a perennial pasture. Mowing/Cutting: Regular mowing or cutting can help to controlSt. John's wort by preventing it from flowering and producing seeds. However, this method alone will not be entirely effective since the plant can still spread underground through its rhizomes. Mowing should be done consistently and repeatedly. Learn more about How to ControlSt. John's Wort. View plant photos, descriptions, maps, treatment options, and more. Erosion Control: With lateral root growth extending .4–3 in (1–8 cm) below the surface, and taproots extending 2–5 ft deep, St. Johnswort could make a good erosion control plant. · Plants spread by seed and creeping roots. Control: Abundant seed production, long viability of the seeds, and the ability of the roots to produce new plants make common St. Johnswort difficult to control. An agronomist can advise on a crop program to support StJohn’s wortcontrol in arable areas. This can reduce the amount of StJohn’s wort seed in the soil before you sow a perennial pasture.
