They have peat or sandy soils. Pocosin's plant vegitation is made up of evergreen trees and shrubs. Bog's soils are made up of spongy acidic peat deposits. They are characterized by evergreen trees and shrubs, and their floor is covered by a thick carpet of sphagnum moss. Their source of water is rainwater.
Fens form non-acidic peat.
They are often covered by grasses, sedges, reeds, and wildflowers. They are a type of a fresh water marsh. Submerged and floating aquatic plants take over pothole's deep water while bulrushes and cattails grow closer to shore. The depressions that form potholes were left by the last ice age. The Destruction of the Wetlands Between the 1970's and the 1980's, half of all the wetlands in the lower forty-eight states, were lost.