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.
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.
NOTIFIABLE ORGANISM. Report to MAF, ARC or DOC biosecurity teams.
Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.