Eurasian Water Milfoil

Eurasia and Africa

General description

Submerged herbaceous freshwater aquatic plant. Grows to 11 m tall, with long, slender, branching stems extending up to the water surface and forming dense mats. Stems with finely divided greyish-green leaves in whorls of 3-4 giving branches a feathery appearance. Small yellow, four-parted flowers project above the water. Fruit forms a hard, segmented capsule containing four seeds.

Freshwater aquatic

While seeds are viable, most spread comes from fragmented stems transported by contaminated machinery, boats, trailers and nets.

Mats of rooting vegetation trap sediment, infill shallow waterways. Impedes drainage, causes flooding, disrupts recreational activities. Out-competes native water plants. Provides poor habitat for native fauna.

Site management

NOTIFIABLE ORGANISM. Report to MAF, ARC or DOC biosecurity teams.

Recommended approaches

Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.

Similar species

parrots feather
Myriophyllum aquaticum

Each Eurasian watermilfoil leaf generally has 12 or more leaflet pairs and this feature can be used about 70 percent of the time to distinguish Eurasian watermilfoil from other milfoil species.

Ceratophyllum demersum

Hornwort has forked leaves as opposed to the pinnate leaves of E. water milfoil.

Search tags

RPMS status

Unwanted Organism - nationwide
Eurasian water milfoil - Main species image