How to Remove Japanese Knotweed

Written by keith dooley
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Japanese knotgrass is an invasive plant that is difficult to stop. Walking through knotgrass can transport seed to other areas, and some plant removal methods, such as pulling the plant out of the ground or burning it, encourage it to grow more. To remove knotgrass, you will need time more than anything else because it is persistent and will keep coming back, but is possible to eventually remove it.

Skill level:
Moderate

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Things you need

  • Weed killer
  • Pruning snips
  • Hand trowel

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Instructions

  1. 1

    Mark off the knotgrass area so everyone knows where it is. Pull the boundary out about 10 yards out from the weed in all directions.

  2. 2

    Designate an entrance to the knotgrass area so people only go in and out at one location. Set up a place to wash off shoe soles after leaving the area so contamination isn't spread.

  3. 3

    Spray Japanese knotgrass with basic weed killer. Wait several days for it to take effect.

  4. 4

    Cut plants down with garden snips. Cut at a height of 6 inches.

  5. 5

    Set the cuttings to the side of the growing area, but within the boundary. Allow to dry out and then burn.

  6. 6

    Cut off new growth many more times as it grows. Always making sure to keep it at about 6 inches. Do this until the plant starts to die.

  7. 7

    Dig out plant and rhizomes. They can be as deep as 2 feet and have roots spread out for several yards.

  8. 8

    Set them aside to completely dry and then burn. Dispose of all burnt material in plastic bags.

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