Madagascar Star Plant Plant Care

Madagascar Star Plant (Thamnoldenlandia ambovombensis) belongs to the Rubiaceae family within the Thamnoldenlandia genus. Madagascar Star Plant is native to Madagascar. Madagascar Star Plant is also known as Ambovombensis Star Plant.

Madagascar Star Plant displays a compact, spreading shrub growth habit, reaching up to 2.5 ft tall with a spread of approximately 3 ft. Madagascar Star Plant produces small, fragrant white flowers in clusters.

Leaf size: approximately 4 inches.

Water a young or newly planted Madagascar Star Plant 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.

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

Thamnoldenlandia ambovombensis tolerates temperatures of 65–80°F. Madagascar Star Plant 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 content. Good drainage is essential for Madagascar Star Plant to prevent waterlogging, which leads to root rot and fungal issues.

Feed Madagascar Star Plant 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 rich, well-draining soil with high organic content. Avoid low spots where water collects after rain.

Madagascar Star Plant is suited to USDA Zone 10b – 11b.

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.

Madagascar Star Plant can spread to about 3 ft (0.9 m) and reach about 3 ft (1 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 plant spacing calculator.

Prune Madagascar Star Plant 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.

Madagascar Star Plant is frost-tender (hardy to USDA zone 10). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Madagascar Star Plant can be propagated through seeds, stem cuttings.

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

Madagascar Star Plant 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.

Madagascar Star Plant grows outdoors in USDA Zone 10b – 11b. It survives winters down to planting zone 10b. Madagascar Star Plant is native to Madagascar. In cooler regions, grow Madagascar Star Plant as a houseplant or bring it indoors before the first frost.