Coprosma acerosa aka Sand Coprosma

Coprosma acerosa, or sand coprosma, is a low evergreen shrub. It belongs to the Rubiaceae family. Its native range covers New Zealand and the Chatham Islands. Records include the North, South, and Stewart Islands. It grows on coastal dunes and also occurs inland. Its habitat reaches about 3,940 feet [1,200 metres] above sea level. It comes from a temperate climate.

The plant spreads along the ground and forms a mat. Reported garden size is about 1.6 feet [0.5 metres] tall. Its listed spread is about 2 feet [0.6 metres]. Older plants may build up to 2 feet [0.6 metres] high. The foliage stays on the plant throughout the year. PFAF lists its flowering season as September to October. Male and female flowers grow on separate plants. Wind carries the pollen between them. Both sexes must grow together to produce seed. The species can cross with other members of its genus.

The fruit is pale blue and can be eaten raw. Each fruit reaches about 0.3 inches [8 millimetres] long. The flesh is juicy and sweet, but has little taste. Roasted seeds can serve as a coffee substitute. The wood yields a yellow dye without a mordant. PFAF lists no known hazards or medicinal uses. That hazard record does not establish safety for every use. It also gives no specific assurance about pets.

Grow sand coprosma in sun or light shade. It prefers moist soil that drains very well. Sandy and loamy soils suit it, though other well-drained soils work. Aim for a neutral to mildly acid soil. It tolerates exposure to sea winds. A sunny rock-garden ledge suits its low, spreading form. It also fits beds and lightly shaded garden edges. PFAF lists USDA zones 7–10, but notes some frost sensitivity. The plant survives at Kew, yet prefers mild winters. It performs poorly in colder parts of Britain.

Seed and autumn cuttings offer ways to raise new plants. Sow stored seed in spring under a cold frame. Germination may take longer than a year, even with fresh seed. Grow seedlings under glass through their first winter. Plant them outside in late spring or early summer. Protect young plants during their first winter outdoors. Cuttings use mature wood from the current season's growth.