Knotweed Complex

QUICK IDENTIFICATION

  • 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



Weed Information


Type Information
Toxicity Non-toxic
Control Repeated cutting, hand-pulling, herbicides and grazing. Contact your County Weed District or local applicator for more information.
Habitat Along waterways, landscaped yards, disturbed soils, forest edges, vacant lots and right-of-ways.
Root Extensive root system
Leaf Shape Broad, heart-shaped
Lifespan Perennial; two years or longer
Priority 1B Weed Limited presence in Montana
Similar Looking Plants Buddleja (butterfly bush), knotgrass, Russian vine, giant and hybrid knotweeds
Important Information It was planted 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.
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