Knotweed Control: 3 Simple Steps for the Non-Professional
2 min read
7 months ago
Published on May 04, 2024
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Table of Contents
Tutorial: How to Control Japanese Knotweed in 3 Simple Steps
Step 1: Preparation
- Identify the Plant: Ensure the plant you are targeting is Japanese knotweed or one of the four species of invasive knotweed commonly found in North America.
- Timing: Fall is the best time for treatment when knotweed plants are transferring sugars down to their underground rhizomes. Treat before a killing frost.
- Tools Needed: Use loppers for big stems and hand pruners for small stems.
Step 2: Cutting the Stems
- Brush Off Dirt: Before cutting, remove any dirt at the bottom of the stems near ground level as dirt can deactivate the herbicide.
- Cutting: Cut the stem about 1 to 10 inches above the ground.
Step 3: Applying Herbicide
- Apply Immediately: Apply the herbicide to the cut stump within about five minutes of making the cut to ensure the herbicide reaches the vascular system of the plant.
- Foam Herbicide: Use a foam herbicide dispenser package containing glyphosate herbicide and blue foaming agent for effective treatment.
- Repeat Process: Cut and apply herbicide to all cut stems to ensure thorough treatment and prevent regrowth.
- Monitor: Keep an eye on the location over the next several years as knotweed rhizomes can lie dormant underground and may require reapplication.
Additional Tips:
- Dispose Properly: Do not stack cut knotweed stems near water bodies as they can sprout roots from nodes and spread.
- Handle Re-sprouts: If re-sprouts occur, pull or weed whip them. Consider reapplication after midsummer if needed.
- Restore Area: After eradicating knotweed, plan to restore the area with native plants to promote biodiversity.
By following these steps and tips, you can effectively control Japanese knotweed and contribute to the preservation of native ecosystems.