Bladder senna
Colutea arborescens
A tough little nitrogen-fixing pioneer that colonises poor dry banks fast and asks for nothing — just watch it, since it self-seeds freely.
Bladder senna in a syntropic line
Bladder senna belongs in the Shrub layer as a Secondary nitrogen-fixing species. Support species, fruit, and nitrogen fixers under the canopy. Rough in-row spacing starts around 1.5 m in a syntropic row. Good line partners include Carob tree, Common sage. As a Secondary species it carries mid-term yield and structure while climax trees slowly claim the canopy.
Tolerances and growing conditions
- Strata
- Shrub
- Lifecycle
- Secondary
- Soil preference
- Sandy, Rocky
- Soil pH range
- 6 – 8.5
- Min. temperature
- -15°C
- Min. rainfall
- 300 mm/year
- Wind tolerance
- High
- Frost tolerance
- Medium
- Growth rate
- Fast
- Irrigation needed
- Low
- Foliage
- Deciduous
- Waterlogging tolerance
- Medium
- Origin
- Mediterranean
- Native to Portugal
- No
How to manage it
Tough nitrogen-fixing pioneer shrub for poor dry banks and disturbed ground; cut back after flowering to keep it bushy and control self-seeding.
How to propagate
Sow seed in spring or take softwood cuttings in summer — both root fast.
Guidance, not a guarantee — success varies by species and skill.
What to watch out for
Seeds and pods are mildly toxic if eaten; self-seeds readily and can naturalise on disturbed sites.
Frequently asked questions about Bladder senna
Is bladder senna frost-hardy?
Yes for winter cold in many climates — generally hardy to around -15°C when dormant, with medium frost tolerance in the catalog. Flowering crops can still lose a season to late frost, so site them carefully.
What soil does bladder senna need?
It does best on sandy, rocky ground, at pH about 6–8.5.
How much water does bladder senna need?
Plan for a rainfall floor around 300 mm/year, plus low irrigation once established.
Can bladder senna handle wet or waterlogged soil?
It has medium waterlogging tolerance — short winter wet is usually fine, standing water is not.
What should I watch out for with bladder senna?
Seeds and pods are mildly toxic if eaten; self-seeds readily and can naturalise on disturbed sites.
Bladder senna in soil templates
- Bladder senna appears in the sandy soil starter lineBrowse sandy templates →
- Bladder senna appears in the loam soil starter lineBrowse loam templates →
- Bladder senna appears in the clay soil starter lineBrowse clay templates →
- Bladder senna appears in the chalky soil starter lineBrowse chalky templates →
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