A salt marsh located on the Baruch plantation at Georgetown, South Carolina includes four vegetation zones (High high marsh, Low high marsh, High low marsh and Low low marsh.) Thirty plants of each of the dominant species in each zone were transplanted into the other three vegetation zones, and thirty plants of each of the dominant species in each zone were dug up and replanted in the same zone to serve as controls. Survival and growth rate of the transplants suggest that several species can tolerate conditions not found in their usual zones. Salicornia virginica of the Low high marsh can grow in the High low marsh and Low low marsh, while Limonium carolinianum of the Low high marsh survived when planted in the High low marsh. The data suggest that there are two forms of Spartina alterniflora, a dwarf form occupying the High low marsh, and a tall form occupying the Low low marsh.