Bristly Starbur Plant Care

Bristly Starbur (Acanthospermum hispidum) belongs to the Asteraceae family within the Acanthospermum genus. Bristly Starbur is native to Central and South America. Bristly Starbur is also known as Acanthospermum humile.

Bristly Starbur displays a low spreading groundcover growth habit, reaching up to 0.5 ft tall with a spread of approximately 1.5 ft. Bristly Starbur produces small yellow daisy-like flowers in clusters.

Leaf size: approximately 2 inches.

Water a young or newly planted Bristly Starbur 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.

Bristly Starbur thrives in full sun to partial shade.

Acanthospermum hispidum tolerates temperatures of 60–85°F. Bristly Starbur prefers humidity levels of 40–70%.

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

Feed Bristly Starbur 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 mix with added organic matter. Avoid low spots where water collects after rain.

Bristly Starbur is suited to USDA Zone 10a – 12b.

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.

Bristly Starbur 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 Bristly Starbur 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.

Bristly Starbur 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.

Bristly Starbur can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to spiny burrweed plant care, which shares the same genus.

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

Bristly Starbur is susceptible to aphids, whiteflies, 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.

Bristly Starbur grows outdoors in USDA Zone 10a – 12b. It survives winters down to planting zone 10a. Bristly Starbur is native to Central and South America. In cooler regions, grow Bristly Starbur as a houseplant or bring it indoors before the first frost.