Callistemon Viminalis 'Slim'

Slim Bottlebrush / Narrow Bottlebrush

Botanical Name: Callistemon viminalis ‘Slim’(syn. Melaleuca viminalis ‘Slim’)
Family: Myrtaceae
Origin: Australia (cultivar selection)
Plant Type: Evergreen shrub / narrow columnar screen

Overview

Ultra-slender, columnar bottlebrush bred for tight spaces. Dense mid-green foliage (often bronze on new growth) hugs upright stems, topped with crimson-red brushes mainly in spring with spot flowers in summer–autumn. Ideal for privacy hedging in side paths and small gardens, or as a feature in pots—tough, tidy and bird-attracting.

Key Features

• Mature Size: 2.5–3.5 m H × 0.8–1.2 m W (keeps narrower with clipping)
• Growth Rate: 30-60 cm per year under good conditions
• Foliage: Narrow mid-green leaves; bronze/copper tints on new growth
• Flowers: Crimson-red bottlebrush spikes (spring; repeats in warm seasons)
• Seasonal Interest: Showy spring flowering + repeat colour; evergreen structure year-round
• Wildlife Value: Attracts honeyeaters and native bees
• Tolerance: Drought-tolerant (once established), heat-tolerant, wind-tolerant, second-line coastal-tolerant; light frost (protect from hard frost)
• Planting Density: Privacy hedge/screen: 0.6–0.8 m centres (≈ 1–1.6 per metre); Specimen/feature: 1–1.5 m apart; excellent in large containers
• Pet Friendly: Non-toxic to cats & dogs

Where It Works Best

• Sunlight: Full sun to part shade (best bloom in sun)
• Soil: Well-drained loam, sandy loam or clay loam (mound on heavy sites)
• Water Needs: Establishment: 2 deep soaks/week for 8–12 weeks. Established: deep soak every 10–14 days in summer (weekly in heatwaves); minimal in winter
• Maintenance: Light prune after flowering to maintain the slim column; mulch; feed in early spring with low-P native fertiliser
• Lifespan: 15-25+ years
• Climate Zones: Temperate & Mediterranean SA, including coastal areas
• Soil pH: Acidic to neutral; tolerates slightly alkaline

Landscape & Design Ideas

• Slim privacy hedge for side boundaries and narrow strips
• Space-saving screen under powerlines or along driveways
• Feature in tall pots for entries and courtyards

Why You Will Love It

A space-saving, low-maintenance bottlebrush that packs crimson colour and dense screening into the narrowest spots—perfect for modern South Australian gardens.