Salt-meadow Cordgrass: Though it has limited food value for wildlife, this opportunistic cordgrass has become the most common marsh plant because it can tolerate the saltwater intrusion that is killing more nutritious plants. If left undisturbed, it would eventually overrun the entire marsh.

Alligatorweed: This free-floating plant with lance-shaped leaves and white flowers grows so densely and prolifically in freshwater that it rapidly clogs open ponds and waterways and must be carefully controlled.. Unlike cordgrass, alligatorweed provides forage for deer, nutria and cattle while herons and egrets come to feed on the small crustaceans living in the tangled roots.