Coprosma 'Karo Red'

Karo Red Mirror Bush

Botanical Name: Coprosma repens 'Karo Red' PBR
Family: Rubiaceae
Origin: New Zealand (cultivar selection)
Plant Type: Evergreen compact shrub

Overview

One of the most visually striking foliage shrubs available for Adelaide gardens, Coprosma repens 'Karo Red' earns its place through sheer year-round drama. Its small, diamond-shaped leaves are an extraordinary combination of vivid emerald green at the centre shading to deep chocolate-red and near-black at the edges, with the intensity of that dark colouring deepening noticeably through autumn and winter to create a genuinely arresting seasonal display.
Compact, naturally tidy and exceptionally hardy, 'Karo Red' thrives in Adelaide's coastal and metropolitan positions with minimal maintenance. It excels in frontline coastal gardens, sunny borders, low hedges and containers, and its outstanding salt and wind tolerance makes it one of the most reliable performers in exposed South Australian positions. A bold, modern foliage plant that works equally well in formal and contemporary garden designs.

Key Features

• Mature Size: 0.9–1.5 m H x 0.8–1.2 m W (compact, dense naturally rounded habit)
• Growth Rate: Slow to moderate; 15–25 cm per year; naturally compact with minimal trimming required
• Foliage: Small, glossy diamond-shaped leaves; vivid emerald green centre shading to deep chocolate-red to near-black edges; colour intensifies dramatically in cooler months; highly reflective surface gives the plant its mirror bush common name; evergreen year-round
• Flowers: Small, inconspicuous flowers; not ornamentally significant; foliage is the primary feature
• Fragrance: Not fragrant
• Seasonal Interest: Glossy bicoloured foliage year-round; dark red-black edge colouring deepens and intensifies through autumn and winter creating the most dramatic display in the cooler months; spring and summer brings fresh new growth
• Wildlife Value: Dense foliage provides shelter for small birds and beneficial insects
• Tolerance: Drought-tolerant once established; heat-tolerant; frost hardy once mature (tolerates light frost); excellent coastal and salt tolerance (frontline suitable); wind-tolerant; adaptable to most well-drained soils including heavy clay; dislikes waterlogging
• Planting Density: Tight hedge: 2–3 plants per metre (40–50 cm spacing); Standard border: 1–2 plants per metre (60–80 cm spacing); suitable for containers (30 cm+)
• Pet Friendly: No known toxicity to cats or dogs

Where It Works Best

• Sunlight: Full sun to part shade; full sun produces the most intense dark red foliage colouring; tolerates dappled shade but colour may be less dramatic
• Soil: Well-drained soils preferred; adaptable to sandy, loamy and clay soils; performs best in light sandy soils but tolerates heavier soils with good drainage; avoid waterlogging
• Water Needs: Establishment: 2 deep soaks/week for 8–12 weeks. Established: low to moderate water needs; deep soak every 2–3 weeks in summer; little to no supplementary watering in cooler months
• Maintenance: Very low maintenance; prune lightly to maintain shape and encourage denser growth; feed with a slow-release fertiliser in spring and again in autumn; naturally compact habit requires minimal intervention
• Lifespan: Long-lived; 10+ years with good drainage
• Climate Zones: Well suited to Adelaide's coastal suburbs, metropolitan areas, Fleurieu Peninsula and Yorke Peninsula; excellent performance in exposed coastal positions
• Soil pH: Adaptable; slightly acidic to neutral preferred; tolerates a range of Adelaide soil types

Landscape & Design Ideas

• Frontline coastal garden feature where the glossy dark foliage and exceptional salt tolerance make it one of the toughest and most attractive options available
• Low formal hedge or border edging where the rich bicoloured foliage provides year-round structure and seasonal colour interest without flowering
• Bold foliage contrast plant paired with silver-grey plants such as Westringia, Leucophyta or Artemisia to maximise the dark-light colour drama
• Contemporary and minimalist garden designs where the near-black winter colouring creates architectural impact in beds, borders and containers
• Mass planting for a striking, low-maintenance carpet of rich dark foliage in sunny garden beds and public landscapes

Why You Will Love It

'Karo Red' is one of those foliage plants that genuinely surprises people the first time they see it. The glossy, near-black edged leaves with vivid green centres are unlike almost anything else in the garden, and as the weather cools through autumn the colour just keeps deepening. Tough, tidy, coastal-proof and incredibly low maintenance, it is a standout performer for Adelaide gardens at any scale.