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Washington State Noxious Weed Control Board |
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Class B Noxious Weed
Parrotfeather
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Plant family:
Haloragaceae
Year listed:
1994
Native to: The Amazon
river, South America.
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Why is it a noxious weed? |
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Parrotfeather is another ornamental aquatic plant
that has escaped cultivation. Infestations can alter aquatic ecosystems.
It forms dense mats that shade out other native aquatic plants, inhibits
water flow, and recreational activities.
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How would I identify it? |
| General Description:
Submerged aquatic plant. Has emergent and submersed
leaves. Long, intertwined rhizomes intertwine to form a dense mat. Leaves:
Flowers:
Stems:
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How does it reproduce? |
| Since only female plants are present in North America parrotfeather reproduces by stem/rhizome fragments. | ||
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Where does it grow? |
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| Parrotfeather is found in freshwater ponds, streams, lakes and canals. | ||
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What is the distribution in Washington State? |
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Click on map to enlarge. |
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How do I control it? |
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General control methods: Parrotfeather can be difficult to control. Since it spreads by stem/rhizome fragments, mechanical methods such as cutting, harvesting and underwater tilling is not advisable. These methods can increase infestation. Cultural: Not effective. Herbicide: Because herbicide availability and regulation differ between States, as well as between countries, we recommend the Washington Department of Ecology web site for information on aquatic weed management and herbicides. Mechanical: Not advised unless area is entirely invaded by plants. Otherwise, mechanical methods may increase infestation. Biological: Parrotfeather is unpalatable to grass carp. |
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Are there plants that may be confused with Parrotfeather? |
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| Parrotfeather looks similar to Eurasian watermilfoil (Myriophyllum spicatum), also a Class C noxious weed in Washington. If you need help with identification, please contact your county weed coordinator. | ||
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For more information |
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For more information, download our
Written Findings. View the Garden Wise Eastern Washington and Western Washington Guides for better noninvasive plant recommendations for your yard or garden.
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Last updated October 01, 2008