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Marsh dewflower, Asian spiderwort, or wart-removing herb is native to eastern Asia and was first noted in 1935 in cultivated rice paddies in South Carolina. It escaped cultivation and has become established in the wild where it is invasive and spreading. It is a low growing, sprawling herbaceous plant with lance-shaped leaves and small solitary flowers with three equal sized petals that are pink to bluish in color. Flowers are borne in the upper leaf axils beginning in late summer (September). Fruits are capsules. It is known from 18 southern states north to Maryland and the District of Columbia. It prefers damp soil along the edges of freshwater tidal marshes, pond margins and slow-moving streams and can also be found inhabiting stream banks, canals, ditches, swamp forests, and other moist to wet disturbed places. Its vigorous growth enables it to out-compete native plants by forming dense mats. Seeds are dispersed by wildlife and it can spread by root fragments during flood events. Do not purchase or plant this invasive. Hand pulling may be effective if done before the plant sets seed. Chemical treatment with glyphosate (e.g. Rodeo®) labeled for wetland use may be effective if applied before seed set but it can be a challenge to control once established.

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