Colutea arborescens

Features and care

*Colutea arborescens*, known as bladder-senna, is a fast-growing, open-habit deciduous shrub. It is valued for its combination of yellow flowers and inflated seed pods, and can be incorporated into shrub borders, informal hedges, and naturalistic dry gardens.

Its compound leaves are divided into green leaflets that provide a light texture. The papilionaceous flowers are clustered in small racemes and appear in summer, sometimes as early as late spring. After flowering, hollow, swollen pods form—translucent at first—which change color as they mature.

It requires a sunny location and dry soil with adequate drainage to prevent water retention. Watering should be minimal and infrequent, reduced almost entirely during the winter. It reaches a height of 2 to 4 meters and has low tolerance for prolonged high humidity. It is hardy in USDA zones 5–9, particularly in locations where the soil remains well-aerated.

At Ornacom we cultivate each specimen directly, guaranteeing a balanced size and abundant flowering from the first years of planting.

Extended species profile

Verified cultivation data, designed so that any visitor can understand at a glance whether the plant is suitable for their climate and garden.

Crop

Exposure

Full sun

Irrigation

ORN-RIEGO 1/5 · very low — very spaced-out waterings; reduce almost completely in winter

Soil / moisture

Dry; well-drained

Bloom

Summer

Climate

USDA Hardiness

Zones 5–9

Compatible climates

Csa, Csb, BSk, Cfb dry

Tolerance to humid climate

ORN-HUM 2/5 · low

Maintenance

Development

ORN-ALT 3/5 · 2–4 m · rapid growth

Pests

ORN-PLAGA 3/5 · medium — sucking/boring insects and foliar or root fungi; monitor for water stress

Pass

ORN-FEEDING 2/5 · low — prioritize soil and organic matter; fertilize in spring only according to analysis and vigor

  • Warning

It prefers poor, dry soils; persistent moisture reduces longevity. Seeds are toxic.

Extended species profile

Verified cultivation data, designed so that any visitor can understand at a glance whether the plant is suitable for their climate and garden.

Crop

Exposure

Full sun

Irrigation

ORN-RIEGO 1/5 · very low — very spaced-out waterings; reduce almost completely in winter

Soil / moisture

Dry; well-drained

Bloom

Summer

Climate

USDA Hardiness

Zones 5–9

Compatible climates

Csa, Csb, BSk, Cfb dry

Tolerance to humid climate

ORN-HUM 2/5 · low

Maintenance

Development

ORN-ALT 3/5 · 2–4 m · rapid growth

Pests

ORN-PLAGA 3/5 · medium — sucking/boring insects and foliar or root fungi; monitor for water stress

Pass

ORN-FEEDING 2/5 · low — prioritize soil and organic matter; fertilize in spring only according to analysis and vigor

  • Warning

It prefers poor, dry soils; persistent moisture reduces longevity. Seeds are toxic.

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