Persian silk tree
Albizia julibrissin
A fast nitrogen-fixing pioneer with feathery foliage that casts soft, dappled shade over understory crops. Handsome and useful, but its wood is brittle and it self-seeds aggressively in warm climates.
Persian silk tree in a syntropic line
Persian silk tree belongs in the High layer as a Secondary nitrogen-fixing biomass species. Main production and shade trees for the line. Rough in-row spacing starts around 3 m in a syntropic row. Good line partners include Almond, Apricot. As a Secondary species it carries mid-term yield and structure while climax trees slowly claim the canopy.
Tolerances and growing conditions
- Strata
- High
- Lifecycle
- Secondary
- Soil preference
- Loam, Sandy
- Soil pH range
- 6 – 7.5
- Min. temperature
- -20°C
- Min. rainfall
- 500 mm/year
- Wind tolerance
- Low
- Frost tolerance
- Medium
- Growth rate
- Fast
- Irrigation needed
- Low
- Foliage
- Deciduous
- Waterlogging tolerance
- Medium
- Origin
- East Asia
- Native to Portugal
- No
How to manage it
Fast nitrogen-fixing pioneer with feathery foliage and light dappled shade; coppice or pollard young to keep wood manageable and encourage bushy resprouting.
How to propagate
Sow seed in spring or take softwood cuttings; seed is faster.
Guidance, not a guarantee — success varies by species and skill.
What to watch out for
A mid-canopy tree (matures 6–12 m). Wood is brittle and branches snap in strong wind. Self-seeds heavily and is invasive in parts of the US and other warm regions; can be short-lived due to vascular wilt.
Frequently asked questions about Persian silk tree
Is persian silk tree frost-hardy?
Yes for winter cold in many climates — generally hardy to around -20°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 persian silk tree need?
It does best on loam, sandy ground, at pH about 6–7.5.
How much water does persian silk tree need?
Plan for a rainfall floor around 500 mm/year, plus low irrigation once established.
Can persian silk tree 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 persian silk tree?
A mid-canopy tree (matures 6–12 m). Wood is brittle and branches snap in strong wind. Self-seeds heavily and is invasive in parts of the US and other warm regions; can be short-lived due to vascular wilt.
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