Bumpy Ash Plant Care

Bumpy Ash (Flindersia ifflana) belongs to the Rutaceae family within the Flindersia genus. Bumpy Ash is native to Papua New Guinea and Queensland. Bumpy Ash is also known as Ifllana Ash, Ivorywood.

Bumpy Ash displays a tall, upright tree growth habit, reaching up to 30 ft tall with a spread of approximately 15 ft. Bumpy Ash produces small white flowers in clusters.

Leaf size: approximately 6 inches.

Water a young or newly planted Bumpy Ash 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.

Bumpy Ash thrives in full sun to partial shade.

Flindersia ifflana tolerates temperatures of 60–85°F. Bumpy Ash prefers humidity levels of 40–70%.

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

Feed Bumpy Ash 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 loamy soil with added compost for nutrients. Avoid low spots where water collects after rain.

Bumpy Ash is suited to USDA Zone 13a.

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.

Bumpy Ash can spread to about 15 ft (4.6 m) and reach about 30 ft (9 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 Bumpy Ash 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.

Bumpy Ash 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.

Bumpy Ash can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to silver ash plant care, which shares the same genus.

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Bumpy Ash is susceptible to scale insects, citrus leaf miner. 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.

Bumpy Ash grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Bumpy Ash is native to Papua New Guinea and Queensland. In cooler regions, grow Bumpy Ash as a houseplant or bring it indoors before the first frost.