Marram Grass

Description

Marram grass (Ammophila arenaria) is a native coastal grass and a familiar sight near coastal villages and on sand dunes along the British coastline. This tough, perennial grass is specially adapted to life on windswept coasts, where shifting sands and salt-laden air make growing conditions challenging.

Marram grass plays a vital role in reducing coastal erosion. Its extensive root systems form dense, matted roots that act as a sturdy anchor, binding loose sand and helping stabilise coastal dunes. As sand builds up around the plant, marram responds by producing more roots and shoots, allowing dunes to grow and develop into semi-fixed systems that support wider plant communities and long-term coastal protection.

How to Identify

Marram grass grows in upright clumps with stiff, spiky leaves that are grey-green in colour and often rolled to conserve water. The leaves have a slightly waxy surface, helping the plant withstand drought and strong winds.

Flowering stems appear in summer, bearing compact seed heads, with windblown seed aiding natural spread across embryo and semi-fixed dunes.

How to Grow

Marram grass thrives in full sun and free-draining, sandy soils, particularly in coastal regions where sand movement is present. It is best planted in low-traffic areas and is commonly used in dune restoration and coastal defence projects rather than ornamental gardens. Once established, Ammophila arenaria requires little maintenance and performs best without fertiliser, as nutrient-poor conditions encourage strong root development and effective sand stabilisation.
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