Ampelodesmos mauritanicus aka Mauritania Vinereed

Ampelodesmos mauritanicus is an evergreen grass in the Poaceae family. Its common names include diss grass and Mauritania vine reed. Kew places its native range in the western and central Mediterranean. Plants For A Future lists countries from Morocco to southwestern Turkey. It grows in dry sites, often close to the coast. It is not native to Britain or Ireland.

This perennial forms a thick clump of tough green leaves. The leaves have a leathery feel and make a rounded mound. The leafy mound reaches about 3.3 feet [1 metre] high and wide. Tall flower stems rise above the leaves and bend outward. RHS gives a garden height range of 4.9–8.2 feet [1.5–2.5 metres]. Its spread ranges from 1.6–3.3 feet [0.5–1 metre]. Plants reach their full size within two to five years.

Flowers appear in late spring and early summer. The flowerheads hang from one side of the arching stems. They have a soft, feathery look and move in the wind. Their colours range from white and cream to purple. RHS describes the flowering stems as reaching about 6.6 feet [2 metres]. The leaves stay green through the year, adding form outside the flowering season.

Grow this grass in full sun and a sheltered spot. RHS also lists partial shade as a suitable position. It needs soil that drains well, with a moderate nutrient level. Sandy soil and loam both suit it. It accepts acid, neutral and alkaline soil, with dry to moist conditions. RHS rates it H3, for mild and coastal parts of Britain. Plants For A Future lists USDA zones 7–10. These ratings use different systems and should not be treated as equivalents.

Its bold clumps suit borders, courtyard gardens and prairie-style planting. RHS also suggests it for cottage gardens and informal schemes. Remove dead leaves and spent flower stems in spring. Divide clumps every few years to keep growth strong. Sow seed in pots in a cold frame in spring. Divide plants from late winter to early spring. RHS reports few problems with pests or disease. People use the leaves for rope and paper. Plants For A Future records no known food or medicinal uses. It also lists no known hazards, though this does not prove safety for every use.