Myriophyllum aquaticum, the genus name for parrot feather, also known as Water Milfoilis a South American native known for its beauty in garden ponds.
It takes on the characteristics of little evergreens, bright green and feathery fronds that can reach to a foot above the water surface. This plant is perennial, with small white flowers and grows new plants from those already rooted.
To identify parrotfeather, look for feather-like leaves that resemble a small fir tree, dense rhizomes beneath the surface and sometimes limp leaves just below the water surface.
Having no natural predator, the plant is banned in the State of Washington. It will infest many shallow creeks and backwater places that are rearing grounds for young salmon and block the salmon's up river run to spawn.
Other locales have restrictions or bans, such as the city of Chicago, Alabama, Connecticut, Maine, Massachusetts, Oklahoma, Nevada, New Hampshire, and Vermont.
If one is not careful, this plant can completely cover the pond surface forming dense mats, reeking all sorts of havoc with the water's pH levels.
THe plant also can be a habitat for mosquito larvae, and in Florida, for the flea beetle. To avert a lot of problems, plant these little beauties in fabric pots, size 14 inches or you can use a plastic pot size 12 inches by 5 inches.
These plants can be planted in hardiness zones 6-11 in full sun to partial shade.