Trials to date have shown that treatment involving herbicide is the most effective means to control both Knotweed and Giant Hogweed. The Invasive Species Council of BC, in conjunction with the BC government, has stated that “chemical control with systematic herbicide is the recommended treatment strategy for knotweeds due to their extensive root structure and aggressive growth and reproduction. This treatment method is the easiest and most successful method”. Eradication typically takes multiple years due to seed bank in the soil. Multi-year treatment is recommended.
The Coastal Invasive Species Committee can provide a certified herbicide applicator to remove Giant Hogweed and/or Knotweed species with a primary treatment during the spring/summer. If needed, a follow-up treatment using Glyphosate can be arranged in the summer/fall.
Please contact us in the future to update the status of the plant. The form is accessible at the button below.