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Oxalis is a perennial broadleaf weed that is also known as Common Yellow Oxalis, Yellow Woodsorrel, Sourgrass, Sheepsorrel and Toadsorrel. Its scientific name is Oxalis stricta.
Oxalis can be identified by its green to purple stems that are mostly unbranched, but branches sometimes grow from the base of this broadleaf weed. Its leaves grow on long petioles with three heart-shaped leaflets. Often confused with Clover, Oxalis leaves often fold up during midday and night. In bloom, Oxalis features small yellow flowers with five petals that occur in clusters. Reproduction occurs by seeds, which explode out from the pods and can scatter considerable distances.
This broadleaf weed is found in most parts of the continental United States.
Proper cultural practices, such as proper mowing and watering, can help prevent Oxalis by creating dense grass, which inhibits this broadleaf weed's ability to grow. Physical removal (i.e., pulling weeds) can be effective, though you run the risk of spreading the seeds to additional areas of your lawn.
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