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Aleman grass

Weed Habitat 

  • A native of tropical and sub-tropical America, this grass was introduced to Queensland as a ponded pasture. It has now invaded seasonally flooded areas, swamps, lakeshores and along rivers.
  • Grows in water to 1 m deep.
  • Most reproduction is vegetative as seed production is poor.


  • An aquatic or semi-aquatic perennial grass, 1-2.5 m high.
  • Stems coarse, thick in the lower parts, arising from long runners that develop roots.
  • Leaves flat, smooth, tapering towards apex, 20 60 cm long, 1 1.5 cm wide, with rough edges.
  • Flower head is 15-25 cm long.

Echinochloa polystachya


Plant Type

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