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Why can salt marsh plants not grow on permanently flooded tidal flats?

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Bald cypress trees with wide, flared trunks stand in still, shallow water in a Louisiana swamp, their green foliage creating a dense canopy. — Wetland Stately bald cypresses (*Taxodium distichum*) thriving in a Louisiana swamp.

Salt marsh plants cannot grow on permanently flooded tidal flats because these areas lack the necessary cycle of flooding and draining required for their development.1

In a salt marsh ecosystem, the vegetation—which consists of halophytic grasses, sedges, and rushes—relies on the periodic exposure of intertidal land to thrive. When land is permanently submerged, it cannot support these specific plant communities. Additionally, growth is prevented in areas where the flooded land is subject to strong currents, as these conditions create an unstable environment that inhibits the establishment of plant life.21