Bladder Senna (Colutea arborescens)

Bladder Senna

Colutea arborescens

Its inflated seed pods add playful texture to gardens. Deciduous flowering shrub; common name: bladder senna.

Full sun
1/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; performs best in full sun for abundant flowering and pod production
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Watering Water deeply once weekly during prolonged dry spells; avoid overwatering to prevent root rot
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Temperature Hardy to -15°C; withstands hot summer temperatures with well-drained soil
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Characteristics

  • Leaf: Pinnate compound leaves with 8–12 oval, gray-green leaflets; soft, slightly fuzzy texture
  • Flower: Pea-like yellow blooms in drooping racemes, 1–2 cm long, with subtle orange accents
  • Fruit: Inflated, bladder-like green seed pods that mature to light brown, 3–5 cm long
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Care Guide

Watering

Water regularly during extended dry periods; allow top 5–7 cm of soil to dry between waterings

Fertilization

Apply a balanced slow-release fertilizer once at the start of growing season. Avoid high-nitrogen fertilizers to prevent excessive foliage growth over flowering

Eggshell powder topdress:Crush dried, clean eggshells into fine powder; dust lightly on soil surface near the base to boost calcium content without attracting pests or causing odor
Pruning
  • Prune immediately after flowering to maintain a rounded, compact shape
  • Remove dead, damaged, or crowded branches to improve air circulation
  • Thin out old wood every 2–3 years to encourage new growth and abundant flowering
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No listed toxicity to cats

Humans: No known toxic effects on humans when ingested or handled

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental garden shrub; attracts bees and other pollinators; seed pods used in dried flower arrangements