Water Pennywort (Hydrocotyle umbellata) is a very common perennial aquatic weed that will form dense mats that creep along shorelines of ponds, lakes and marshes. It has bright green round leaves that alternate on a long stem. These circular leaves are typically the size of a half dollar. Long stems are attached at center of each leaf. Water Pennywort has delicate clusters of tiny 5-petaled white flowers. It reproduces from seed or roots. There is no known biological method of control.
3 control methods:
1) Physical removal is an option for seed and root reduction. This method can be difficult because new weeds can sprout from seeds and root fragments left behind.
2) Aquacide Pelletsare a systemic aquatic herbicide that is best applied early spring as new growth begins to appear. Repeat treatment 3-5 weeks after the first application may be needed to kill the entire root system.
3) Aqua Neat Liquid and Shore-Klear Liquid are a second systemic option best applied mid-season when all the weeds are above the water surface and in full bloom. Again, repeat treatment 3-5 weeks after the first application may be needed to kill the entire root system.
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