- 1). Cut back the Japanese knotweed in early summer. This reduces the vigor of the rhizomes by removing the leaves that collect solar energy. Use a mower or string trimmer depending on the terrain.
- 2). Apply glyphosate in late summer before the knotweed stems are taller than 3 feet. Measure the recommended amount of glyphosate into the backpack sprayer and dilute with water. The amount depends on the acreage you are treating.
- 3). Agitate the backpack sprayer and then apply the product at the lowest pressure and lowest drop setting on the nozzle. Do not apply when there is wind or when rain is expected within a couple of hours.
- 4). Monitor the area for at least six months and spot apply the glyphosate as needed. The chemical is a systemic herbicide that works its way into the vascular and rhizome system of the knotweed to penetrate all areas of the plant.
- 5). Apply a 4 to 5 inch layer of mulch to prevent and smother any new growth. Plant native plants to fill in the area and choke out and persistent knotweed.
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