Spineless Horsebrush Plant Care

Spineless Horsebrush (Tetradymia axillaris) belongs to the Asteraceae family within the Tetradymia genus. Spineless Horsebrush is also known as Tetradymia axillaris.

Spineless Horsebrush displays a low, spreading shrub growth habit, reaching up to 2 ft tall with a spread of approximately 4 ft. Spineless Horsebrush produces small yellow flowers in clusters.

Leaf size: approximately 1.5 inches.

Water a young or newly planted Spineless Horsebrush every 14–21 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.

Spineless Horsebrush thrives in full sun.

Tetradymia axillaris tolerates temperatures of 50–85°F. Spineless Horsebrush prefers humidity levels of 20–60%.

Well-draining sandy soil with low fertility. Good drainage is essential for Spineless Horsebrush to prevent waterlogging, which leads to root rot and fungal issues.

Choose a spot with full sun and well-draining sandy soil with low fertility. Avoid low spots where water collects after rain.

Spineless Horsebrush 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.

Spineless Horsebrush can spread to about 4 ft (1.2 m) and reach about 2 ft (1 m) tall. Space plants about 4 ft (1.2 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 Spineless Horsebrush 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.

Spineless Horsebrush 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.

Spineless Horsebrush can be propagated through seeds. Similar propagation techniques also apply to cottonbush plant care, which shares the same genus.

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Spineless Horsebrush 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.

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