Alpinia Caerulea 'Red Back'

Native Ginger / Red Back Australian Ginger

Botanical Name: Alpinia caerulea ‘Red Back’
Family: Zingiberaceae
Origin: Eastern Australia (rainforest understory form)
Plant Type: Evergreen clump-forming perennial (rhizomatous)

Overview

A lush, shade-loving native ginger with broad green leaves that have a striking red–purple underside. In spring–summer it bears creamy white flower spikes, followed by blue berries in late summer–autumn (the white pulp and spicy seeds are a traditional bush food). Perfect for tropical-look borders, shady screens and large pots in sheltered SA gardens—best with consistent moisture and protection from hot, dry winds.

Key Features

• Mature Size: 1.5-2.5 m H x 1-2 m W (clump)
• Growth Rate: 30-60 cm per year under good conditions
• Foliage: Large, glossy green leaves with red/purple underside; bold, lush texture
• Flowers: Creamy white flowers in spring–summer (lightly fragrant flowers); blue berries (late summer–autumn)
  
• Seasonal Interest: Year-round lush foliage; summer bloom; ornamental blue fruit
• Wildlife Value: Flowers for pollinators; berries attract birds
• Tolerance: Heat-tolerant if soil is kept evenly moist; Light frost may scorch foliage—protect in winter; not frost hardy
• Planting Density: Shady screen/backdrop: 0.75–1 m apart; Mass/underplanting: 0.6–0.8 m apart; Containers: 35–50 cm pots (size up as clumps expand)
• Pet Friendly: Non-toxic to cats/dogs; any plant ingestion may upset tummies

Where It Works Best

• Sunlight: Part shade to shade (morning sun OK; avoid hot afternoon sun)
• Soil: Moist, humus-rich, free-draining; keep roots cool with mulch
• Water Needs: Establishment: 2 deep soaks/week for 8–12 weeks. Established: keep consistently moist—deep soak weekly in summer (2× in heatwaves); light watering in winter as needed
• Maintenance: Remove old leaves/canes; feed in spring–summer; divide rhizomes in late spring
• Lifespan: 10–20+ years in sheltered, well-watered sites
• Climate Zones: Temperate SA in sheltered, frost-free microclimates; great in large containers you can protect
• Soil pH: Neutral (tolerates slightly acidic–slightly alkaline)

Landscape & Design Ideas

• Shady screen/backdrop under trees
• Tropical-look borders
• Courtyard and patio pots
• Underplanting with ferns and shade groundcovers (not a privacy hedge in full sun)

Why You Will Love It

Big, glossy leaves with a red-backed glow, cream flowers and blue berries—a lush, native ginger that brings instant tropical feel to shaded SA spaces with minimal fuss.