Lyme Grass

Description

Lyme grass (Leymus arenarius), formerly known as Elymus arenarius, is a robust coastal grass native to northern Europe. Commonly called blue dune or blue lyme grass, it is most often found growing on sand dunes, where it plays an important role in stabilising loose sand and reducing soil erosion.

This striking grass is valued for its flat, steel-blue foliage and strong, spreading root system, which helps bind sandy soils and protect exposed landscapes. Its upright, arching leaves form a dense ground cover, making it well-suited to coastal dunes, open ground, and naturalistic planting schemes.

In summer, tall stems rise above the foliage bearing narrow, spike-like flower heads, which fade to pale straw tones as the season progresses.

How to Identify

Lyme grass can be identified by its stiff, blue-grey leaves and upright growth habit. The foliage is narrow and arching, with a waxy surface that helps the plant tolerate wind, salt, and dry conditions. Blue-green flower spikes appear in early summer and mature into distinctive seed heads later in the season.

How to Grow

Lyme grass grows best in full sun and well-drained soils, particularly sandy or clay soils where other plants may struggle. It is drought- and salt-tolerant once established and requires very little maintenance. Cut back old foliage in autumn or late winter to encourage fresh growth in spring.

Its resilience and spreading root system make it ideal for stabilising sand dunes, controlling erosion, and providing year-round structure in coastal and exposed sites.