Water-lettuce populations often form large expanses of dense, impenetrable floating mats limiting boat traffic, recreation, flood control, and wildlife use.

This freshwater perennial creates thick mats that reduce oxygen levels, block sunlight and prevent growth of submerged vegetation.

According to USDA, NRCS (2018), P. stratiotes is a Class C noxious weed in Alabama, a B list noxious weed in California, a potentially invasive, banned species ...

Water lettuce is a prohibited plant in Florida, Louisiana, Mississippi, and Texas, and is considered a noxious weed in South Carolina and Delaware.

Why is it a problem? Forms dense mats which completely cover a water surface. The mats clog waterways & irrigation equipment, reduce waterflow, impede ...

Extensive mats of water lettuce on water surfaces reduce light penetration and dissolved oxygen levels in the water, thus altering native aquatic plant and fish ...

9 апр. 2024 г. · Water lettuce has invaded one of South Africa's most important rivers, the Vaal River, on the border of the Gauteng and Free State provinces.

Water lettuce is an unlisted non-native species. These species have no restrictions on sale, purchase, or possession, but they may not be introduced into a free ...

7 февр. 2024 г. · U.S. Habitat: Water lettuce invades lakes, ponds and slow moving streams in tropical, subtropical and warmer temperate regions.

Species Profile: Water Lettuce. Grows into dense mats that clog waterways (Ramey 2001)