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Name

Knobweed

Weed Habitat 

  • A native to Central America, this plant grows in disturbed areas in full sunlight on heavy soils retaining above average moisture. It usually occurs as a common weed of roadsides, creek banks, cultivated headlands and rundown pastures.

Description 

  • An erect aromatic robust herb with several quadrangular branching stems 60-250 cm high.
  • Leaves are bright green, opposite and widely spaced on stems, up to 12 cm long, 5 cm wide, tapering at both ends, margins irregularly toothed.
  • Small white flowers in compact globular heads about 1.5 cm diameter on stalks to 5 cm long in leaf axils.
  • Fruit is a 4-lobed capsule divided into 4 seed-like nutlets, which when ripe, rattle when the plant is shaken.

Hyptis capitata

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Plant Type
Leaf Arrangement
Other weed identifiers
Plant Life Cycle
Weed Declaration
Currently not declared however under the Biosecurity Act 2014 you still have an obligation to prevent or minimise a biosecurity risk posed by a pest.
Weed Spread