Phyllanthus st-johnii Plant Care

Phyllanthus st-johnii (Phyllanthus st-johnii) belongs to the Phyllanthaceae family within the Phyllanthus genus. Phyllanthus st-johnii is native to the islands of Bora Bora, Tahaa, Raiatea, and Moorea.

Phyllanthus st-johnii displays an upright, bushy shrub growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Phyllanthus st-johnii produces small greenish-yellow flowers.

Leaf size: approximately 4 inches.

Water a young or newly planted Phyllanthus st-johnii 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.

Phyllanthus st-johnii thrives in bright indirect light. Avoid placing Phyllanthus st-johnii in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Phyllanthus st-johnii tolerates temperatures of 65–80°F. Phyllanthus st-johnii prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining soil mix with added perlite for improved drainage. Good drainage is essential for Phyllanthus st-johnii to prevent waterlogging, which leads to root rot and fungal issues.

Feed Phyllanthus st-johnii 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 soil mix with added perlite for improved drainage. Avoid low spots where water collects after rain.

Phyllanthus st-johnii is suited to USDA Zone 13b.

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.

Phyllanthus st-johnii can spread to about 2 ft (0.6 m) and reach about 3 ft (1 m) tall. Space plants about 2 ft (0.6 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 plant spacing calculator.

Prune Phyllanthus st-johnii 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.

Phyllanthus st-johnii 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.

Phyllanthus st-johnii can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to chamber bitter plant care, which shares the same genus.

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Phyllanthus st-johnii is susceptible to aphids, scale insects, spider mites. 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.

Phyllanthus st-johnii grows outdoors in USDA Zone 13b. It survives winters down to planting zone 13b. Phyllanthus st-johnii is native to the islands of Bora Bora, Tahaa, Raiatea, and Moorea. In cooler regions, grow Phyllanthus st-johnii as a houseplant or bring it indoors before the first frost.