Bladder Senna Plant Care

Bladder Senna (Colutea arborescens) belongs to the Fabaceae family within the Colutea genus. Bladder Senna is native to Europe and North Africa. Bladder Senna is also known as Common Bladder Senna, Mediterranean Bladder Senna, Scarlet Bladder Senna.

Bladder Senna displays a deciduous shrub or small tree growth habit, reaching up to 10 ft tall with a spread of approximately 8 ft. Bladder Senna produces pea-like yellow flowers in clusters.

Leaf size: approximately 3 inches.

Water a young or newly planted Bladder Senna every 7–14 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.

Bladder Senna thrives in full sun to partial shade.

Colutea arborescens tolerates temperatures of 50–85°F. Bladder Senna prefers humidity levels of 30–70%.

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

Feed Bladder Senna every 6 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 well-draining sandy loam with added organic matter. Avoid low spots where water collects after rain.

Bladder Senna is suited to USDA Zone 12a.

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.

Bladder Senna can spread to about 8 ft (2.4 m) and reach about 10 ft (3 m) tall. Space plants about 8 ft (2.4 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 Bladder Senna 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.

Bladder Senna 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.

Bladder Senna can be propagated through seeds, softwood cuttings. Similar propagation techniques also apply to eastern bladder senna plant care, which shares the same genus.

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

Bladder Senna 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.

Bladder Senna grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Bladder Senna is native to Europe and North Africa. In cooler regions, grow Bladder Senna as a houseplant or bring it indoors before the first frost.