Silver wattle
Acacia dealbata
A fast nitrogen-fixer with early bee forage and quick biomass — brilliant on paper, but seriously invasive in Mediterranean climates. Only plant where you can keep it firmly contained.
Silver wattle in a syntropic line
Silver wattle 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 1.9 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
- Sandy, Loam
- Soil pH range
- 4.5 – 7
- Min. temperature
- -6°C
- Min. rainfall
- 600 mm/year
- Wind tolerance
- Medium
- Frost tolerance
- Medium
- Growth rate
- Fast
- Irrigation needed
- Low
- Foliage
- Evergreen
- Waterlogging tolerance
- Medium
- Origin
- Australia
- Native to Portugal
- No
How to manage it
Very fast nitrogen-fixing biomass tree with early bee forage; coppice hard and often to control size and keep suckering in check.
How to propagate
Scarify seed or soak 24 hours; hardwood cuttings root easily in warm conditions.
Guidance, not a guarantee — success varies by species and skill.
What to watch out for
Highly invasive in Mediterranean Europe, California and South Africa — suckers and seeds prolifically, especially after fire. Short-lived; check local invasive-species status before planting.
Frequently asked questions about Silver wattle
Is silver wattle frost-hardy?
Yes for winter cold in many climates — generally hardy to around -6°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 silver wattle need?
It does best on sandy, loam ground, at pH about 4.5–7.
How much water does silver wattle need?
Plan for a rainfall floor around 600 mm/year, plus low irrigation once established.
Can silver wattle 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 silver wattle?
Highly invasive in Mediterranean Europe, California and South Africa — suckers and seeds prolifically, especially after fire. Short-lived; check local invasive-species status before planting.
Design your line to see how your land fits Silver wattle.
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