A psammosere is the sequence of plant succession in stages, initiated on sand. It is seral community, an ecological succession that began life on newly exposed coastal sand. Most common psammoseres are sand dune systems.

Primary succession can happen when bare sand is colonised by plants. Over time, the sand builds up into sand dunes, raising the ground above the height of sea level. Succession in sand dunes is sometimes called a psammosere.