Coastal Rosemary Plant Care

Coastal Rosemary (Westringia acifolia) belongs to the Lamiaceae family within the Westringia genus. Coastal Rosemary is native to Western Australia.

Coastal Rosemary displays a compact, bushy shrub growth habit, reaching up to 3 ft tall with a spread of approximately 3 ft. Coastal Rosemary produces small white or purple flowers in clusters.

Leaf size: approximately 2 inches.

Water a young or newly planted Coastal Rosemary every 7–14 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established shrubs mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Coastal Rosemary thrives in full sun to partial shade.

Westringia acifolia tolerates temperatures of 50–80°F. Coastal Rosemary prefers humidity levels of 40–70%.

Well-draining sandy soil with added compost for nutrients. Good drainage is essential for Coastal Rosemary to prevent waterlogging, which leads to root rot and fungal issues.

Feed Coastal Rosemary every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established shrubs in good soil often need little extra feeding, so let weak growth or pale foliage guide you.

Stop feeding by late summer so new growth can harden before winter.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Choose a spot with full sun to partial shade and well-draining sandy soil with added compost for nutrients. Avoid low spots where water collects after rain.

Coastal Rosemary is suited to USDA Zone 12a.

Plant container-grown or balled-and-burlapped shrubs in spring or early autumn, setting the root flare at soil level, and water well after planting.

Coastal Rosemary can spread to about 3 ft (0.9 m) and reach about 3 ft (1 m) tall. Space plants about 3 ft (0.9 m) apart so mature crowns don't crowd each other, and plant at least half that distance from buildings, fences and paths.

Planning a row or hedge? Try the plant spacing calculator.

Prune Coastal Rosemary while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.

If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the shrub in one year.

Coastal Rosemary is frost-tender (hardy to USDA zone 12). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Coastal Rosemary can be propagated through softwood cuttings, semi-hardwood cuttings. Similar propagation techniques also apply to native rosemary plant care, which shares the same genus.

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Coastal Rosemary is susceptible to aphids, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Coastal Rosemary grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Coastal Rosemary is native to Western Australia. In cooler regions, grow Coastal Rosemary as a houseplant or bring it indoors before the first frost.