Four-angled Syzygium Plant Care

Four-angled Syzygium (Syzygium quadrangulatum) belongs to the Myrtaceae family within the Syzygium genus. Four-angled Syzygium is native to Fiji and Tonga. Four-angled Syzygium is also known as Square-stemmed Lilly Pilly.

Four-angled Syzygium displays a tall, dense tree or shrub growth habit, reaching up to 20 ft tall with a spread of approximately 15 ft. Four-angled Syzygium produces small, white, fluffy flowers in clusters.

Leaf size: approximately 4 inches.

Water a young or newly planted Four-angled Syzygium 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.

Four-angled Syzygium thrives in full sun to partial shade.

Syzygium quadrangulatum tolerates temperatures of 60–85°F. Four-angled Syzygium prefers humidity levels of 50–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining, slightly acidic soil with added organic matter like compost or peat moss. Good drainage is essential for Four-angled Syzygium to prevent waterlogging, which leads to root rot and fungal issues.

Feed Four-angled Syzygium every 6 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, slightly acidic soil with added organic matter like compost or peat moss. Avoid low spots where water collects after rain.

Four-angled Syzygium is suited to USDA Zone 13a – 12b.

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.

Four-angled Syzygium can spread to about 15 ft (4.6 m) and reach about 20 ft (6 m) tall. Space plants about 15 ft (4.6 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 tree spacing calculator.

Prune Four-angled Syzygium 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.

Four-angled Syzygium is frost-tender (hardy to USDA zone 13). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Four-angled Syzygium can be propagated through seeds, semi-hardwood cuttings. Similar propagation techniques also apply to waterberry plant care, which shares the same genus.

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Four-angled Syzygium 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.

Four-angled Syzygium grows outdoors in USDA Zone 13a – 12b. It survives winters down to planting zone 13a. Four-angled Syzygium is native to Fiji and Tonga. In cooler regions, grow Four-angled Syzygium as a houseplant or bring it indoors before the first frost.