Skip to main content


Weed Habitat 

  • Snakeweeds invade disturbed areas e.g. creek lines and roadsides.
  • Invades monsoon vine forests where soil has been disturbed by pigs.
  • Can invade overgrazed pastures.


  • Perennial shrubs to 2 m high with tough stems and a woody rootstock.
  • Young stems somewhat quadrangular.
  • Leaves opposite, shallow-toothed.
  • Flowers with 5 petals in stiff curved spikes from the top of the branches.
  1. Stachytarpheta mutabilis - Lower leaf surfaces, rachis (Main axis of flower head) and calyx hairy, flowers pink to red.
  2. Stachytarpheta cayennensis - Lower leaf surfaces, rachis and calyx hairless, rachis slender, leaves membranous, flowers blue to almost white.
  3. Stachytarpheta jamaicensis - Lower leaf surface, rachis and calyx hairless, rachis stout, leaves fleshy, flowers mauve, blue, violet or purple.

Stachytarpheta cayennensisStachytarpheta jamaicensisStachytarpheta jamaicensis


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