The variety of habitats along its western and southern coasts is often soft sands in shallow subtropical waters, ideal for these plants.
In contrast to seaweeds, usually found on rocks, seagrass colonises sandy ocean beds to form dense stands and meadows.
Some areas of the southern coast provide suitable habitat, such as those at King George Sound and the Archipelago of the Recherche, the warmer water of the Leeuwin Current contributes the diversity of these seagrass communities.
The western coast contain notable and diverse seagrass beds; Cockburn Sound and the Swan River estuary, and the Houtman Abrolhos, Rottnest and other islands.
Seagrasses are the foundation of complex ecosystems, primarily from the ability to colonise inshore coastal sand with its roots and matted rhizomes.