 The fringing vegetation of the estuarine portion of the Kalgan River is dominated by the saltwater "paperbark" trees surrounded by dense stands of coastal saw sedge and shore rushes.The downstream freshwater parts of the river have a much greater variety of species, with a fringing forest that includes swamp paperbark, marri, jarrah, wattle and Western Australian peppermint trees.Further inland, species such as swamp yate, flooded gum and varieties of "Banksia" and "Hakea" are found.