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t-shirts giant salvinia t-shirts salvinia t-shirts salvinia molesta t-shirts fern t-shirts ferns t-shirts plant t-shirts plants t-shirts flora t-shirts weed t-shirts weeds t-shirts aquatic fern t-shirts aquatic plant t-shirts aquatic plants t-shirts aquatic weed t-shirts noxious weed t-shirts

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Giant salvinia (Salvinia molesta) is a fast-growing fern that can clog ponds and lakes. Forming mats up to 2 feet thick, the plant gobbles up oxygen and blocks sunlight needed by other water dwellers. A tiny weevil (Cyrtobagous salvinae), is under study as a biocontrol for this weed.