Silver Wattle (Acacia retinodes)

Silver Wattle

Acacia retinodes

Soft silver foliage sways like a cloud, carrying honey-scented blooms. Evergreen flowering shrub; common names: Silver Wattle, Swamp Wattle.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; thrives in coastal areas with moderate wind exposure; partial shade recommended in hot inland climates.
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Watering Water deeply when the top 5 cm of soil is dry; drought-tolerant once established, avoid overwatering to prevent root rot.
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Temperature Hardy to light frost (-5°C); performs best in temperate to warm climates, avoid prolonged heat above 38°C.
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Characteristics

  • Leaf: Silvery-green phyllodes (modified leaf stalks) are linear to lanceolate, 5–15 cm long, with a prominent central midrib.
  • Flower: Bright yellow, spherical flower heads clustered in axillary racemes, producing a sweet, honey-like fragrance.
  • Stem/Bark: Smooth grey-brown bark; young stems are covered in fine, silvery hairs that fade with maturity.
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Care Guide

Watering

Water regularly during the first 2 years of establishment; reduce watering once mature

Fertilization

Apply balanced slow-release fertilizer once at the start of growth. Avoid high-nitrogen fertilizers to prevent excessive foliage growth at the expense of flowering.

Eggshell powder topdress:Crush dried eggshells into fine powder; sprinkle 1 teaspoon per plant base every 6 months; water gently to release nutrients into the soil.
Pruning
  • Prune immediately after flowering to maintain a compact shape and encourage bushier growth for the following season.
  • Remove dead, damaged, or crossing branches in early spring to improve airflow and light penetration.
  • Thin overcrowded inner stems to reduce disease risk and promote even flowering.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirms no toxic effects to cats.

Humans: No documented toxic effects to humans; ingestion of large quantities may cause mild gastrointestinal irritation.

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Garden Uses & Culture

Culture: Symbolizes resilience in Australian native horticulture; often used in wildlife gardens to support pollinators.

Usage: Ornamental garden shrub; fragrant cut flowers for floral arrangements; provides shelter for small native birds.