Silver wattle
Acacia dealbata · Fabaceae
📷 Donald Hobern from Copenhagen, Denmark · CC BY 2.0
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around silver wattle and prepare for winter.
ID card
- Foliage
- Evergreen, finely divided and blue-green
- Flowering
- February to March, clusters of bright yellow flowers with intense fragrance
- Mature size
- 6 to 8 m in height, spreading and airy habit
- Growth
- Fast, gains 60 to 80 cm per year under favorable conditions
- Hardiness
- Cold-sensitive, tolerates down to -5 to -8 °C depending on variety
- Origin
- Australia (New South Wales)
- Soil type
- Well-drained, tolerates poor and even chalky soils
- Family
- Fabaceae (legumes)
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Mimosa thrives in well-draining, poor soil—that's actually a win, no fertilizing needed. Prune lightly after flowering to keep it compact, otherwise it gets too airy and brittle.
The common mistake
Overfeeding or overwatering: this causes soft growth and kills off that abundant February bloom.
The pro's trick
Seed propagation: collect the pods in summer, gently scarify the seeds with sandpaper, then soak for 24h in lukewarm water.
Care
Sunlight
Mimosa demands full sun for generous flowering. Choose a location sheltered from cold northern winds and late frosts. In cold regions, a south-facing exposure or against a warm wall is ideal. Partial shade reduces flower production.
Watering
Water regularly during the first year to establish the root system. Once established, mimosa tolerates drought well and needs little supplemental watering. In containers or dry regions, keep the soil moist but not waterlogged. Reduce watering in winter.
Pruning and maintenance
Prune lightly after flowering (April-May) to maintain a balanced shape and open up the center. Avoid severe pruning which weakens the tree. Remove dead or crossing branches. Formative pruning is useful in the early years to structure the habit.
Soil
Mimosa adapts to most soils but thrives in well-draining potting mix. It tolerates chalky soils unlike many acacias. Improve compacted soil with compost or gravel to prevent waterlogging. Light mulch at the base helps maintain moisture in summer.
Fertilizing
Mimosa is undemanding regarding fertilizer thanks to its ability to fix atmospheric nitrogen. An application of compost or balanced fertilizer in spring is sufficient. Avoid excess nitrogen which promotes foliage at the expense of flowering. In containers, apply diluted fertilizer every 3-4 weeks during growth.
Pests and diseases
Mimosa is generally resistant to parasites. Watch for scale insects and spider mites in hot, dry conditions. Powdery mildew can appear in humid climates: ensure good air circulation around the crown and avoid wetting the foliage. Root rot is the main threat if persistent waterlogging occurs.
Did you know?
Mimosa became an emblem of the French Côte d'Azur in the 19th century: its yellow flowers announcing spring's arrival, they were sold massively in Cannes and Grasse, where an annual festival was even created that still endures today. Introduced from Australia in 1820, this tree conquered the Mediterranean and now represents the mildness of Mediterranean climate.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
Add this plant to my garden →Plants from the same family
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- Common PeaLathyrus oleraceus
- Honey locustGleditsia triacanthos
- Hairy greenweedGenista pilosa
Tips generated and checked by Viridia — adapt them to your local climate.