Coast Bonefruit Plant Care

Coast Bonefruit (Threlkeldia diffusa) belongs to the Amaranthaceae family within the Threlkeldia genus. Coast Bonefruit is also known as Coastal Bonefruit.

Coast Bonefruit displays a low spreading groundcover growth habit, reaching up to 0.5 ft tall with a spread of approximately 1.5 ft. Coast Bonefruit produces small inconspicuous flowers.

Leaf size: approximately 1 inches.

Water a young or newly planted Coast Bonefruit 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.

Coast Bonefruit thrives in full sun to partial shade.

Threlkeldia diffusa tolerates temperatures of 50–80°F. Coast Bonefruit prefers humidity levels of 40–70%.

Well-draining sandy soil with added organic matter for nutrients. Good drainage is essential for Coast Bonefruit to prevent waterlogging, which leads to root rot and fungal issues.

Feed Coast Bonefruit 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 full sun to partial shade and well-draining sandy soil with added organic matter for nutrients. Avoid low spots where water collects after rain.

Coast Bonefruit is suited to USDA Zone 12a.

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.

Coast Bonefruit can spread to about 2 ft (0.5 m) and reach about 1 ft (0 m) tall. Space plants about 2 ft (0.5 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 Coast Bonefruit 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.

Coast Bonefruit 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.

Coast Bonefruit can be propagated through seeds, stem cuttings.

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Coast Bonefruit is susceptible to aphids, 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.

Coast Bonefruit grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Coast Bonefruit as a houseplant or bring it indoors before the first frost.