Plants that grow in wetlands are technically called hydrophytes and hydrophytic plants. Hydrophytes are plants that grow in water or areas that periodically have water. Depending on which wetland type you are trying to enhance/create will dictate what wetland mix you should use.
Wetland plants can be classified into the following general categories:
Emergent wetland plants are rooted in the soil where the basal portions exist beneath the water surface but the leaves and stems are above water.
Submerged plants spend their entire life below the water surface.
Floating-leaved plants have leaves that float on the water’s surface while the roots are anchored in the substrate.