Marlberry Plant Care

Marlberry (Austromyrtus tenuifolia) belongs to the Myrtaceae family within the Austromyrtus genus. Marlberry is native to the Sydney area in eastern Australia.

Marlberry displays a compact, bushy shrub growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Marlberry produces small white or pink flowers in clusters.

Leaf size: approximately 3 inches.

Water a young or newly planted Marlberry every 7–10 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.

Marlberry thrives in full sun to partial shade.

Austromyrtus tenuifolia tolerates temperatures of 50–80°F. Marlberry prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining acidic soil with high organic content, such as a mix of peat moss, pine bark, and perlite. Good drainage is essential for Marlberry to prevent waterlogging, which leads to root rot and fungal issues.

Feed Marlberry 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 acidic soil with high organic content, such as a mix of peat moss, pine bark, and perlite. Avoid low spots where water collects after rain.

Marlberry 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.

Marlberry can spread to about 2 ft (0.6 m) and reach about 3 ft (1 m) tall. Space plants about 2 ft (0.6 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 Marlberry 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.

Marlberry 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.

Marlberry can be propagated through softwood cuttings, seeds. Similar propagation techniques also apply to midy berry plant care, which shares the same genus.

See all plants toxic to cats and plants toxic to dogs.

Marlberry is susceptible to aphids, scale insects, caterpillars. 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.

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