The weed in the photo from N.C. State was discussed by Cherokee Master Gardeners. Following is some additional data.
This perennial weed is commonly found in very wet areas. Dollarweed can float in water. Plants reproduce from rhizomes, and have leaves that are on long stalks. Solid scalloped leaves are attached to the stalk on the underside and form an inverted "umbrella" shape. Clusters of white flowers form in late summer.
CULTURAL PRACTICES Perennial broadleaf turf weeds are capable of living more than two years. They thrive in weak, thin turf; golf fairways and roughs; home lawns; playfields; and industrial grounds. Proper turf maintenance is the key to control of this weed. First, select adapted turfgrass cultivars for your area and then properly fertilize, mow, and water to encourage dense growth.
This weed is an indicator plant for poor drainage.
HERBICIDE INFORMATION Dollarweed is a difficult weed to control for an entire growing season. Repeat spring applications of trifloxysulfuron (Monument), metsulfuron (Manor, Blade, etc.), or imazaquin (Image) in tolerant turf, as well as two, three, and four way broadleaf herbicides offer postemergence control.
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