Grevillea rosmarinifolia aka Rosemary Grevillea

Grevillea rosmarinifolia, or rosemary grevillea, is an evergreen shrub in the Proteaceae family. It comes from southeastern Australia, from southeastern New South Wales to Victoria. Its common name points to its narrow, rosemary-like leaves. The shrub has a loose, spreading shape with thin branches. Its leaves stay green through all four seasons.

Garden plants often reach 5–7 feet [1.5–2 metres] tall and wide. The RHS gives upper sizes of 8 feet [2.5 metres] tall and 13 feet [4 metres] wide. In British gardens, plants may reach just 3 feet [1 metre] tall. Climate thus affects the size gardeners can expect. Plants may take 10–20 years to reach their full size. The stiff, dark green leaves have edges that curl under. Fine, silky hairs cover their lower sides. Their tips can be sharp, so take care when handling them.

Pink to red flowers crowd the ends of the branches. The RHS describes the blooms as deep rose-red. Flowering times differ between the two garden accounts. Oregon State records flowers in autumn, winter and spring, with fewer in summer. The RHS gives a season from late winter through late summer. These accounts show a long bloom season, though its timing varies. Both sources describe dense flower clusters at the shoot tips.

Grow this shrub in full sun and soil that drains well. Sandy soil or loam suits it, with an acid to neutral pH. Choose a sheltered spot outdoors. It copes with heat, dry sites and an arid climate. Feed lightly, and avoid fertilisers rich in phosphorus. Oregon State lists hardiness to USDA Zone 8. The RHS rates it H4 for UK conditions. Under glass, use lime-free compost with added grit and give full light. Pruning may be needed to limit its size there.

Rosemary grevillea suits coastal gardens, courtyards and beds beside walls. It also fits flower borders and gardens with a Mediterranean climate. Its spreading form needs room as it grows. New plants can come from seed, semi-hardwood cuttings or grafting. Pests cause few problems, though honey fungus can occur on rare occasions. The RHS warns that contact can irritate skin or cause allergic reactions in people and pets. Wear gloves and other protective clothing when handling it. The supplied sources give no edible use for this shrub.