Castor bean
Ricinus communis
A dramatic, lightning-fast pioneer that pumps out biomass for quick mulch and shade, then gets cut back and regrown. Its seeds are deadly poisonous — keep it well away from kids and livestock.
Castor bean in a syntropic line
Castor bean belongs in the High layer as a Placenta biomass species. Main production and shade trees for the line. Rough in-row spacing starts around 1 m in a syntropic row. Good line partners include Almond, Apricot, Bitter orange. As a Placenta species it establishes fast, then gets cut back or phased out as longer-lived layers take over.
Tolerances and growing conditions
- Strata
- High
- Lifecycle
- Placenta
- Soil preference
- Loam, Sandy
- Soil pH range
- 5.5 – 7.5
- Min. temperature
- 0°C
- Min. rainfall
- 400 mm/year
- Wind tolerance
- Low
- Frost tolerance
- Low
- Growth rate
- Fast
- Irrigation needed
- Medium
- Foliage
- Deciduous
- Waterlogging tolerance
- Medium
- Origin
- Africa
- Native to Portugal
- No
How to manage it
Very fast biomass pioneer, often grown as a cut-back annual for rapid mulch and quick shade; chop-and-drop before seed set to limit spread.
How to propagate
Sow seed directly in warm soil; germinates fast and grows explosively.
Guidance, not a guarantee — success varies by species and skill.
What to watch out for
All parts, especially seeds, contain ricin and are extremely toxic/potentially lethal to humans and livestock - never plant near children or grazing animals. Self-seeds readily and is invasive/weedy in warm, frost-free climates.
Frequently asked questions about Castor bean
Is castor bean frost-hardy?
Yes for winter cold in many climates — generally hardy to around 0°C when dormant, with low frost tolerance in the catalog. Flowering crops can still lose a season to late frost, so site them carefully.
What soil does castor bean need?
It does best on loam, sandy ground, at pH about 5.5–7.5.
How much water does castor bean need?
Plan for a rainfall floor around 400 mm/year, plus medium irrigation once established.
Can castor bean 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 castor bean?
All parts, especially seeds, contain ricin and are extremely toxic/potentially lethal to humans and livestock - never plant near children or grazing animals. Self-seeds readily and is invasive/weedy in warm, frost-free climates.
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