Knotweed

What is knotweed? Knotweeds are all perennial plants native to Asia. The plants were brought here as ornamentals in gardens.

This plant or group of plants, including: Japanese knotweed, Giant knotweed, Himalayan knotweed, Bohemian knotweed, a.k.a. Reynoutria, or Fallopia japonica, are all behaving badly away from their natural enemies. Insects and diseases that normally keep a native plant in check are not present to slow the spread of knotweeds.

• Knotweed can sprout from a piece of stalk as small as a dime.
• Knotweed can push through 4 inches of asphalt.
• Knotweed spreads by water.
• Knotweed spreads by mowers and equipment.
• Knotweed is extremely difficult to control without herbicides.
• Knotweed dominates streambanks an river edges.