Colutea istriaBladder Senna

The Colutea istria, or Bladder Senna, is a hardy deciduous shrub native to southern Europe and the Mediterranean region. It is prized for its ornamental, inflated seed pods that resemble small bladders and its bright yellow, pea-shaped flowers, which bloom in summer. Growing up to 2 to 4 metres tall, it is an attractive and adaptable plant for dry, well-drained soils and sunny locations.

This low-maintenance shrub is an excellent choice for erosion control, hedges, and naturalised plantings in drought-prone areas.

Specifications

• Height2 to 4 metres
• Width1.5 to 3 metres
• Native toSouthern Europe, Mediterranean
• FoliagePinnate, light green leaves; deciduous
• Growth rateModerate

Conditions

• SoilPrefers well-drained, sandy, or rocky soils; tolerates nutrient-poor conditions
• LightFull sun to partial shade
• WaterLow; highly drought-tolerant once established
• ClimateThrives in temperate and Mediterranean regions

Additional Features

• FlowersBright yellow, pea-shaped flowers bloom in summer, attracting pollinators
• Seed PodsUnique, inflated, bladder-like seed pods that persist into autumn
• UsesIdeal for hedging, erosion control, and as a feature in naturalised gardens
• SpacingPlant 2 to 3 metres apart for hedges or standalone displays
• Low MaintenanceRequires little care; prune lightly after flowering to shape
• Pest ResistanceNaturally resistant to most pests and diseases
• Environmental BenefitsSupports pollinators and stabilises soil in dry conditions

The Bladder Senna is a striking and versatile shrub, perfect for adding colour, texture, and ecological value to drought-tolerant gardens and landscapes.