Rattlebox Plant Care

Rattlebox (Sesbania punicea) belongs to the Fabaceae family within the Sesbania genus. Rattlebox is native to South America. Rattlebox is also known as Poison Pod, Scarlet Sesbania, Coffee Senna.

Rattlebox displays a fast-growing small tree growth habit, reaching up to 15 ft tall with a spread of approximately 10 ft. Rattlebox produces showy clusters of red, pink, or white pea-like flowers.

Leaf size: approximately 6 inches.

Water a young or newly planted Rattlebox every 3–7 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established trees mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Rattlebox thrives in full sun to partial shade.

Sesbania punicea tolerates temperatures of 60–85°F. Rattlebox prefers humidity levels of 40–70%.

Rich, well-draining soil with added compost or organic matter. Good drainage is essential for Rattlebox to prevent waterlogging, which leads to root rot and fungal issues.

Feed Rattlebox every 4 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established trees 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 rich, well-draining soil with added compost or organic matter. Avoid low spots where water collects after rain.

Rattlebox is suited to USDA Zone 13a.

Plant container-grown or balled-and-burlapped trees in spring or early autumn, setting the root flare at soil level, and water well after planting.

Rattlebox can spread to about 10 ft (3 m) and reach about 15 ft (5 m) tall. Space plants about 10 ft (3 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 tree spacing calculator.

Prune Rattlebox 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 tree in one year.

Rattlebox 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.

Rattlebox can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to prickly sesbania plant care, which shares the same genus.

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Rattlebox is susceptible to aphids, caterpillars, leafhoppers. 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.

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