What is parrot's feather?(Myriophyllum aquaticum)
- Parrot's feather is a weed of freshwater ponds, dams and waterways.
- Parrot's feather is a declared weed in Tasmania under the Tasmanian Weed Management Act 1999. The importation, sale and distribution of parrot's feather are prohibited in Tasmania.
How to identify parrot's feather
feather is a perennial (long-lived) freshwater herb with yellow-green
stems reaching 5 m in length. The leaves are feathery in appearance and
occur in whorls, becoming more densely packed towards the end of the
stems. The flowers are small, white and unisexual; all plants in
Australia have only female flowers.
- Parrot's feather roots on
the muddy bottom as well as on adjacent saturated mud and gravels,
extending from the bank or rising up through the water to form a dense
mass of tangled stems.
- Rapid growth occurs in summer, slowing in
winter and recommencing the following spring. Once fully established,
an infestation does not grow greatly in extent, with the new growth
replacing the previous year's stems which die off.
Image top: Close-up of Parrot's feather, photo: Kiowa Fenner
Image above (l - r): Parrots feather infestation; stem of parrot's feather, photo: Stephen Welsh; Parrot's feather
Parrot's feather in Tasmania
feather is recorded as an occasional weed of ponds, dams, drainage
ditches and streams in Tasmania. Localised infestations occur in the
north and north-west and around Bellerive in the south (see map). Aquarium occurrences also occur.
feather forms dense mats that impede water flow and limit recreational
activities, while the floating mats which often break off from an
infestation can block hydroelectric intakes and irrigation pumps, and
small streams causing flooding.
What is the legal status of parrot's feather in your area?
Detailed management and control guidelines for parrot's feather can be found in the Parrot's Feather Control Guide
. Refer also to Herbicides for Parrot's Feather Control
. For further information see DPIPWE's Weed Links and Resources
Parrot's Feather Control Guide
Herbicides for Parrot's Feather Control
Statutory Management Plan for Parrot's Feather
Weed Links and Resources
Other useful links
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