Silver Wattle (Acacia dealbata)

Silver Wattle

Acacia dealbata

A fast-growing evergreen tree that paints the late winter landscape with clouds of fragrant yellow blooms. Other names: mimosa.

Requires full sun for optimal growth and prolific flowering.
1/week
Easy
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Plant Needs

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Sunlight Requires full sun for optimal growth and prolific flowering.
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Watering Drought-tolerant once established; water deeply but infrequently.
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Temperature Prefers warm, Mediterranean climates; mature trees can tolerate light frosts.
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Characteristics

  • Leaves: Bipinnately compound, silvery-grey to glaucous green, finely divided and fern-like;
  • Flowers: Small, spherical, bright yellow fluffy flower heads arranged in large racemose inflorescences, highly fragrant;
  • Bark: Smooth and silvery-grey on young branches, becoming deeply fissured and dark grey to black with age;
  • Fruit: Flattened seed pods, purplish-brown, containing several black seeds.
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Care Guide

Watering

Water deeply once a week during active growth and dry spells.

Fertilization

Apply a low-phosphorus organic mulch or compost; generally does not require heavy feeding.. Fertilization recommendations description

Coffee Ground Compost:Sprinkle a small amount of used, cooled coffee grounds around the base to maintain slight soil acidity and provide gentle nitrogen. Do not apply thickly to avoid mold.
Pruning
  • Prune immediately after flowering to shape the tree and encourage bushy growth;
  • Remove dead, diseased, or crossing branches to maintain good air circulation;
  • Avoid hard pruning into old wood, as it may not resprout reliably.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Non-toxic per general botanical safety guidelines; ingestion of large amounts of plant material may cause mild, self-limiting gastrointestinal upset.

Humans: Generally considered non-toxic, though pollen may cause allergic reactions in sensitive individuals.

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Garden Uses & Culture

Culture: In Europe, particularly in France and Italy, the blooming branches (often sold as "mimosa") are traditionally given on International Women's Day to symbolize elegance and strength.

Usage: Widely used as an ornamental tree, in floristry for cut flowers, and historically in the perfume industry for its essential oils.