Water Weeds

Eurasian Water Milfoil

Myriophyllum spicatum

Class 1 noxious weed throughout NSW under the NSW Noxious Weeds Act 1993 its dense canopy can interfere with boating, swimming, fishing, or other aquatic activities. Suppresses native plants; impacts equilibrium between aquatic organisms
  • Family Haloragaceae
  • Origin Eurasia
  • Habit Submerged perennial aquatic herb in water from 0.5 to 10 m deep, reddish-brown to whitish-pink stems from root crown branch repeatedly into a dense leaf canopy very close to the surface
  • Leaves Feather like, pinnately compound ,olive-green, less than 4 cm long, in groups of four whorled at each node of the stem, usually with more than 12 divisions
  • Flowers Pink small four petalled flowers in whorls held on spike up to 8 cm above water lie parallel when wind pollinated fruit sets
  • Fruit Wind pollinated fruit minor in forming new colonies
  • Roots Crown with branching stems
  • Dispersal Reproduction is almost entirely vegetative
  • Control Shading, manual harvesting, mechanical harvesting can cause reinfestation with fragmentation, manipulation of water levels useful

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