Spiny Poison Bush Plant Care

Spiny Poison Bush (Gastrolobium spinosum) belongs to the Fabaceae family within the Gastrolobium genus. Spiny Poison Bush is native to Southwest Australia. Spiny Poison Bush is also known as Box Poison, Wattle Poison.

Spiny Poison Bush displays an upright, bushy shrub growth habit, reaching up to 4 ft tall with a spread of approximately 3 ft. Spiny Poison Bush produces brightly colored pea-like flowers in clusters.

Leaf size: approximately 2 inches.

Water a young or newly planted Spiny Poison Bush every 7–14 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.

Spiny Poison Bush thrives in full sun to partial shade.

Gastrolobium spinosum tolerates temperatures of 60–80°F. Spiny Poison Bush prefers humidity levels of 40–60%.

Well-draining sandy loam with added organic matter. Good drainage is essential for Spiny Poison Bush to prevent waterlogging, which leads to root rot and fungal issues.

Feed Spiny Poison Bush 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 loam with added organic matter. Avoid low spots where water collects after rain.

Spiny Poison Bush is suited to USDA Zone 13a.

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.

Spiny Poison Bush can spread to about 3 ft (0.9 m) and reach about 4 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 Spiny Poison Bush 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.

Spiny Poison Bush 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.

Spiny Poison Bush can be propagated through seeds, cuttings. Similar propagation techniques also apply to gastrolobium acrocaroli plant care, which shares the same genus.

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

Spiny Poison Bush is susceptible to aphids, caterpillars, 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.

Spiny Poison Bush grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Spiny Poison Bush is native to Southwest Australia. In cooler regions, grow Spiny Poison Bush as a houseplant or bring it indoors before the first frost.