Hottentot Fig

Few ground covers hold a dune the way Carpobrotus edulis does. The Hottentot Fig is a South African coastal succulent whose fleshy three-angled leaves form a dense mat over sand and rubble, flushing red under drought stress, and whose large daisy-like flowers open yellow and age through to pink.
It is used for dune stabilisation, embankments, roadside batters and any exposed coastal ground where irrigation is not on offer.
The Hottentot Fig is the default answer for holding bare coastal sand together with no water and no maintenance budget.