Knightia deplanchei Plant Care

Knightia deplanchei (Knightia deplanchei) belongs to the Proteaceae family within the Knightia genus. Knightia deplanchei is native to New Caledonia.

Knightia deplanchei displays a small tree, shrub growth habit, reaching up to 10 ft tall with a spread of approximately 8 ft. Knightia deplanchei produces showy clusters of small, colorful flowers.

Leaf size: approximately 6 inches.

Water a young or newly planted Knightia deplanchei 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.

Knightia deplanchei thrives in full sun to partial shade.

Knightia deplanchei tolerates temperatures of 50–80°F. Knightia deplanchei prefers humidity levels of 40–70%.

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

Feed Knightia deplanchei 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, acidic soil with high organic matter content. Avoid low spots where water collects after rain.

Knightia deplanchei 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.

Knightia deplanchei can spread to about 8 ft (2.4 m) and reach about 10 ft (3 m) tall. Space plants about 8 ft (2.4 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 Knightia deplanchei 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.

Knightia deplanchei 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.

Knightia deplanchei can be propagated through seeds, cuttings. Similar propagation techniques also apply to rewarewa plant care, which shares the same genus.

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Knightia deplanchei 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.

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