Invasive water plant poised to overwhelm Potomac watershed.

[elleng]

'It springs to life each year in freshwater ponds and lakes as temperatures rise. By the middle of summer, the foliage is so thick and bushy at the surface that the water below is plunged into darkness, with hardly any oxygen seeping in from the air above.

Across Northern Virginia, the invasive aquatic plant has spread to dozens of locations, according to state and federal scientists. It looks a lot like Trapa natans, the water chestnut that has blanketed waterways on Maryland’s Upper Shore and the Northeast United States, but it isn’t.'>>>

https://www.democraticunderground.com/1127139292

[soothsayer]

1. First the snakehead fish...