Spongeplant can form dense mats on the water that crowd out almost all other plants.
Spongeplant is a native of America, it can be floating or rooted. Its leaves are very thick and leathery which are rounded or, in younger leaves, somewhat heart-shaped. Underside of young leaves have a central disc of red spongy cells.
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State Prohibited Weed
The plant must be eradicated from the land and that land must be kept free of the plant