Flindersia australis

Crow's Ash

Botanical Name: Flindersia australis
Family: Rutaceae
Origin: Subtropical and warm temperate rainforests of coastal New South Wales and Queensland
Plant Type: Large evergreen native canopy tree

Overview

Crow's Ash is a stately Australian rainforest tree celebrated for its dense, broad-domed canopy of glossy mid-green pinnate foliage, generous spring flush of creamy-white flower panicles, and the extraordinary prickly star-shaped seed pods that split open to reveal ornamental woody "mocha stars" coveted in floral art and craft. Proven in street, avenue and large-garden roles across eastern and south-eastern Australia, it combines handsome year-round structure with genuine wildlife value. Highly adaptable across clay, loam and sandy soils and tolerant of moderate frost and drought once established, Crow's Ash rewards patient gardeners with a magnificent long-lived shade tree that only improves with age.

Key Features

• Mature Size: 15–20 m H × 5–10 m W
• Growth Rate: Moderate to fast; approximately 30–50 cm per year in typical Adelaide garden conditions; upright and densely branched when young, gradually broadening into a full rounded dome as the tree matures
• Foliage: Glossy mid-green pinnate leaves with 5–11 leaflets; evergreen; dense, layered canopy delivers deep shade year-round; smooth pale grey-brown bark on mature trunks
• Flowers: Masses of small creamy-white flowers held in large terminal panicles; spring to early summer; lightly fragrant; highly attractive to bees, butterflies and nectar-feeding birds
• Seasonal Interest: Distinctive prickly woody seed pods follow flowering, splitting open in summer through autumn into five-pointed star shapes — sought-after for dried floral arrangements and botanical craft projects
• Wildlife Value: Flowers draw bees, butterflies and honeyeaters; ornamental pods provide seed for parrots and finches; dense evergreen canopy offers nesting and roosting habitat year-round
• Tolerance: Drought-tolerant once established; moderate frost (to approx. −3 °C); coastal salt spray; wind; clay soils; heat
• Planting Density: Street or avenue tree: 8–10 m between trunks (10–13 trees per 100 linear metres); large-garden feature specimen: allow a minimum 5–8 m clearance radius from structures, pools and other trees
• Pet Friendly: Not listed as toxic to cats or dogs; prevent pets from consuming large quantities of seeds, pods or bark as a precaution

Where It Works Best

• Sunlight: Full sun preferred for best canopy density and flowering; tolerates part shade in sheltered positions
• Soil: Highly adaptable — clay, loam or sandy soils; well-drained to moderately moisture-retentive; non-invasive root system suitable for urban settings
• Water Needs: Establishment: water deeply 2–3 times per week for the first 8–12 weeks, reducing to one deep weekly soak through the first full summer. Established: very low; one deep fortnightly water during hot dry summers; winter and spring rainfall generally sufficient without supplementary irrigation
• Maintenance: Low once established; keep the root zone weed-free and mulched for the first 2–3 years; annual mulch renewal recommended; minimal pruning needed — allow the natural rounded form to develop; remove dead wood in late winter if required
• Lifespan: 100+ years in suitable conditions
• Climate Zones: Best suited to Adelaide's coastal suburbs, inner plains and warm temperate zones; sheltered positions on the lower Hills fringe; less suited to exposed high-altitude Hills sites where frosts regularly exceed −5 °C; performs well in warm Riverland and Murraylands areas with occasional deep irrigation
• Soil pH: Highly adaptable — acid, neutral or alkaline (pH 5.5–8.0)

Landscape & Design Ideas

• Plant as a majestic street or avenue tree — its upright early habit and non-invasive root system make it suitable for council-approved urban streetscapes and median strips
• Use as a long-lived centrepiece feature tree in large private gardens, acreages, schools or parkland where enduring deep shade, seasonal floral display and wildlife habitat are the brief
• Group three to five trees at 8–10 m spacing along a property boundary to create a tall canopy buffer, windbreak and privacy screen for large alfresco entertaining areas

Why You Will Love It

Crow's Ash brings the grandeur of the Queensland and NSW rainforest to South Australian gardens — a hardworking, wildlife-rich native that earns its place with year-round glossy foliage, a glorious spring flush of white blossom, and those extraordinary star-burst seed pods that stop visitors in their tracks. Give it room, give it time, and it will reward you with decades of deep shade, seasonal drama, and a constant parade of birds and pollinators that transform your garden into a living habitat.