Swamp plants are plants that are regularly above water and are flooded from time to time. Not all marsh plants can survive permanently under water.
So pay attention when buying these marsh plants! Can they be submerged permanently or not? Do you use them in a paludarium at the water’s edge? Do you use them in an open top aquarium and can they grow above the tank? Or are they on the edge of the pond? All reasons why one of these plants can or cannot be used in the aquarium or pond.