Trematolobelia singularis Plant Care

Trematolobelia singularis (Trematolobelia singularis) belongs to the Campanulaceae family within the Trematolobelia genus. Trematolobelia singularis is native to Hawaii.

Trematolobelia singularis displays a low rosette, clumping growth habit, reaching up to 1.5 ft tall with a spread of approximately 1 ft. Trematolobelia singularis produces tubular flowers in shades of blue, purple, or white.

Leaf size: approximately 4 inches.

Water a young or newly planted Trematolobelia singularis every 7–10 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established shrubs mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Trematolobelia singularis thrives in bright indirect light. Avoid placing Trematolobelia singularis in direct, harsh sunlight for extended periods, as this can scorch the foliage.

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

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

Feed Trematolobelia singularis every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established shrubs 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 bright indirect light and well-draining, acidic soil with high organic matter content. Avoid low spots where water collects after rain.

Trematolobelia singularis is suited to USDA Zone 13a.

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

Trematolobelia singularis can spread to about 1 ft (0.3 m) and reach about 2 ft (0 m) tall. Space plants about 1 ft (0.3 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 plant spacing calculator.

Prune Trematolobelia singularis 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 shrub in one year.

Trematolobelia singularis 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.

Trematolobelia singularis can be propagated through seeds, division of offsets.

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

Trematolobelia singularis is susceptible to aphids, spider mites, mealybugs. 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.

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