Knotweed Complex


  • Fleshy new shoots are pointed at the tip and resemble asparagus shoots
  • Hollow bamboo-like stem
  • Large, heart-shaped leaves
  • Greenish to creamy-white small flowers grouped in plume-like clusters at the end of the stems
  • Height 15 to 19 feet

Video Information

Weed Pictures

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Weed Information

ControlRepeated cutting, hand pulling, herbicides and grazing. Contact your County Weed District or local Applicator for more information.
HabitatAlong waterways, landscaped yards, disturbed soils, forest edges, vacant lots and right of ways.
RootExtensive root system.
Leaf ShapeBroad, heart-shaped.
LifespanPerennial; two years or longer.
Priority 1B WeedLimited presence in Montana.
Similar Looking PlantsBuddleja (butterfly bush), knotgrass, Russian vine, giant and hybrid knotweeds.
Important InformationFound at old home sites where it was planted as an ornamental. Plants are not frost tolerant and die back at the end of each season. They can cause serious damage to structures with growth.