Louisiana Home Lawn Series banner. A guide to maintaining a healthy Louisiana lawn.

Dollarweed


Description

Dollarweed (Hydrocotyle spp.), also known as pennywort, is a perennial weed common throughout Louisiana. It is typically found growing in lawn areas with moist or wet soil. As a moisture-loving weed, dollarweed can also be found growing in bodies of water. It produces flowers in summer and spreads via seed and rhizomes (underground stems). Its ability to spread underground and establish quickly makes dollarweed a difficult weed to control in lawns.

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Identification

Dollarweed can be identified by its shiny, silver-dollar-shaped, bright-green leaves. Leaf edges are undulated (widely wavy), and stems are attached at the center of each leaf’s underside. Stems are from rhizomes (underground stems), which can form underground chains connecting several aboveground leaves. It has a low growth habit and produces tiny white flowers that are clustered at the top of flower stalks. For more information on dollarweed identification and characterization, reference the USDA Plants Database.


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Circular leaf

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Stem attachment


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Rhizome chain


Cultural control practices

The best way to prevent or reduce weed encroachment is to maintain a healthy lawn through regular mowing and proper fertilization and soil pH management. Properly maintaining a lawn through these cultural practices promotes dense and vigorous turfgrass and allows the lawn to better compete with weeds. Below are the recommended mowing and nitrogen fertility rates recommended for each turfgrass species. In addition to these lawn care practices, manual removal of weeds may also be necessary. If possible, dig up rhizomes when physically removing dollarweed. Improving drainage may be necessary for long-term control of dollarweed.

Turfgrass Species Mowing Height Nitrogen Rate (per 1,000 ft2 per year)
Bermudagrass 1 to 2 inches Up to 3 pounds
Centipedegrass 1 to 2.5 inches Up to 2 pounds
St. Augustinegrass 2.5 to 3 inches Up to 3 pounds
Zoysiagrass 1 to 2.5 inches Up to 2 pounds

Chemical control practices

In addition to cultural practices, herbicide applications may be required to achieve effective weed control. Apply post-emergent herbicides in late spring when dollarweed is observed in the lawn. Metsulfuron is the most effective herbicide on dollarweed. However, repeated applications may be necessary to achieve control. When using any type of herbicide, always follow the manufacturer's labeled directions.

When applying any type of herbicide, you must follow the manufacturer’s labeled directions. For more information regarding pesticides for turfgrass please reference the Louisiana Suggested Chemical Weed Control Guide.

St. Augustinegrass Centipedegrass Zoysiagrass Bermudagrass
Post-emergence Herbicide Active Ingredients
metsulfuron methyl Yes Yes
Yes
Yes
2, 4-D + dicamba + mecoprop Yes
Yes
Yes
Yes
2, 4-D + dicamba + mecoprop + carfentrazone
Yes
Yes
Yes
Yes
atrazine Yes
Yes
Yes
No

For information regarding weed identification and control options please contact your local LSU AgCenter Extension Parish Office.


Download here: Louisiana Home Lawn Series: Dollarweed 3624-C

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