Black Myrtle Plant Care

Black Myrtle (Nothofagus moorei) belongs to the Nothofagaceae family within the Nothofagus genus. Black Myrtle is native to high altitude areas of eastern Australia. Black Myrtle is also known as Fagales.

Black Myrtle displays a tall, deciduous tree growth habit, reaching up to 100 ft tall with a spread of approximately 50 ft. Black Myrtle produces inconspicuous flowers, small clusters.

Leaf size: approximately 4 inches.

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

Black Myrtle thrives in full sun to partial shade.

Nothofagus moorei tolerates temperatures of 50–80°F. Black Myrtle prefers humidity levels of 40–70%.

Well-draining, acidic soil with high organic content. Good drainage is essential for Black Myrtle to prevent waterlogging, which leads to root rot and fungal issues.

Feed Black Myrtle every 8 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established trees 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. Avoid low spots where water collects after rain.

Black Myrtle is suited to USDA Zone 12a.

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

Black Myrtle can spread to about 50 ft (15.2 m) and reach about 100 ft (30 m) tall. Space plants about 50 ft (15.2 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 tree spacing calculator.

Prune Black Myrtle 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 tree in one year.

Black Myrtle 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.

Black Myrtle can be propagated through seeds, hardwood cuttings. Similar propagation techniques also apply to roble plant care, which shares the same genus.

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Black Myrtle 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.

Black Myrtle grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Black Myrtle is native to high altitude areas of eastern Australia. In cooler regions, grow Black Myrtle as a houseplant or bring it indoors before the first frost.