Parrot Feather

Myriophyllum aquaticum
Invasive Emergent
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Quick ID Summary
What It Looks Like
Feathery bright green leaves growing from branching stems that are brownish red to green. Parts of the plant grow up to 12 inches out of the water.
Where It Grows
Lakes, ponds, and streams throughout the United States.
How It Spreads
Fragmentation.
Status
Not a native plant species. Dense surface mats outcompete desirable plants, reduce recreation, clog drains and streams, and create ideal habitat for mosquito larvae.
Parrot feather growing emergent above the water surface
Parrot Feather — Myriophyllum aquaticum

Identification

Parrot feather gets its name from the feathery bright green leaves that grow from the stems. The stems branch and run brownish red to green.

The defining behavior is vertical. Although this is a submerged plant, parts of it grow up to 12 inches out of the water. If you are looking at feathery milfoil-like foliage standing above the surface, you are almost certainly looking at parrot feather.

It is a rooted aquatic plant found in lakes, ponds, and streams throughout the United States, though it is not a native species.

Telling Parrot Feather from Eurasian Watermilfoil

These two are often misidentified as one another, and they are members of the same plant family, so the resemblance is real. The separation is simple and reliable: Eurasian watermilfoil grows only below the water surface, whereas parrot feather produces emergent stems. Look at the surface, not the leaves.

Why It Matters

Dense mats that form at the surface outcompete desirable aquatic plants. Growth also reduces recreational usage and clogs drains and streams.

There is a public health angle as well: parrot feather creates an ideal habitat for mosquito larvae to hatch, increasing mosquito populations around the water.

Control Approach

Because parrot feather breaks the surface, treatments that reach emergent foliage matter here in a way they do not for fully submerged weeds.

Mixing. Harvester is mixed at 1 quart Harvester to 1 gallon Cutrine to improve results.

After treatment. Apply pond dye to reduce sunlight, monthly for best results, and use Muck Remover pellets to break down decaying parrotfeather and other muck in the pond.

Recommended Treatment Products

These are the products Natural Waterscapes recommends for parrot feather, with the role each one plays. Read the label and confirm the product suits your waterbody before applying.

Quick Results, No Restrictions
Aquathol K
Provides excellent control with quick results. There are no water use restrictions after use.
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Granular Option
Aquathol Super K
The granular form, with the same quick results and no water use restrictions.
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Fast Contact Control
Harvester
A fast control solution. Mix with Cutrine at 1 qt Harvester to 1 gal Cutrine. A contact herbicide - must come in contact to kill.
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Mixing Partner
Cutrine Plus
Mixed with Harvester at 1 gallon Cutrine to 1 quart Harvester.
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Whole Pond, Slow
Sonar AS
Takes 30 to 60 days. The entire pond must be treated, and it is only for ponds with little or no flow. Sonar AS and Sonar RTU are the available options.
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After Treatment
Pond Dye
Applied monthly to reduce sunlight reaching new growth.
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After Treatment
Muck Remover Pellets
Breaks down decaying parrotfeather and other muck in the pond.
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Common Questions

How do I tell parrot feather from Eurasian watermilfoil?

Eurasian watermilfoil grows only below the water surface. Parrot feather produces emergent stems that grow up to 12 inches out of the water.

Is parrot feather native?

No. Although it is found throughout the United States, it is not a native plant species.

Does parrot feather attract mosquitoes?

It creates an ideal habitat for mosquito larvae to hatch and increases mosquito populations.

What is the mix rate for Harvester and Cutrine?

1 quart Harvester to 1 gallon Cutrine.

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