Clermontia samuelii Plant Care

Clermontia samuelii (Clermontia samuelii) belongs to the Campanulaceae family within the Clermontia genus. Clermontia samuelii is native to Maui.

Clermontia samuelii displays a tall, upright shrub growth habit, reaching up to 5 ft tall with a spread of approximately 3 ft. Clermontia samuelii produces showy, tubular flowers in various colors.

Leaf size: approximately 6 inches.

Water a young or newly planted Clermontia samuelii every 7–10 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.

Clermontia samuelii thrives in filtered sunlight. Avoid placing Clermontia samuelii in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Clermontia samuelii tolerates temperatures of 60–75°F. Clermontia samuelii prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Rich, well-draining soil with high organic matter content. Good drainage is essential for Clermontia samuelii to prevent waterlogging, which leads to root rot and fungal issues.

Feed Clermontia samuelii 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 filtered sunlight and rich, well-draining soil with high organic matter content. Avoid low spots where water collects after rain.

Clermontia samuelii 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.

Clermontia samuelii can spread to about 3 ft (0.9 m) and reach about 5 ft (2 m) tall. Space plants about 3 ft (0.9 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 Clermontia samuelii 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.

Clermontia samuelii 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.

Clermontia samuelii can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to kīhāpai plant care, which shares the same genus.

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

Clermontia samuelii is susceptible to aphids, spider mites, scale insects. 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.

Clermontia samuelii grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Clermontia samuelii is native to Maui. In cooler regions, grow Clermontia samuelii as a houseplant or bring it indoors before the first frost.