Crinum pedunculatum

River Lily / Swamp Lily

Botanical Name: Crinum pedunculatum
Family: Amaryllidaceae
Origin: Eastern Australia (including South Australia)
Plant Type: Evergreen clump-forming perennial (large strappy foliage)

Overview

Crinum pedunculatum is a bold, architectural Australian native perennial prized for its lush strappy foliage and large, fragrant white lily-like flowers. Exceptionally well suited to Adelaide and South Australian conditions, it thrives in a wide range of soils and is remarkably tolerant of heat, drought, humidity and occasional waterlogging once established.

Flowering from late spring through summer, Crinum pedunculatum produces dramatic clusters of white blooms held high above the foliage, adding both height and fragrance to the landscape. Tough, long-lived and low maintenance, it is ideal for feature planting, mass planting, and difficult sites where reliability is key.

Key Features

• Mature Size: 1.5-2.0 m H x 1.5-2.0 m W (large clumping habit)
• Growth Rate: Moderate; approx. 15–30 cm per year once established
• Foliage: Broad, glossy deep-green strap leaves; evergreen and highly architectura
• Flowers: Large white lily-like flowers in clusters; late spring–summer
  
• Fragrance: Fragrant flowers, with a sweet lily-like scent, often stronger in the evening
• Seasonal Interest: Evergreen foliage year-round with showy summer flowering
• Wildlife Value: Flowers attract bees and other pollinators
• Tolerance: Excellent heat tolerance; Drought tolerant once established; Handles periodic waterlogging and heavier soils; Light frost tolerant; Performs well in coastal conditions; Wind tolerant
• Planting Density: Mass planting: 1–2 plants per m²; Feature planting: allow 1.2–1.5 m spacing
• Pet Friendly: Mildly toxic if ingested — keep away from pets and children

Where It Works Best

• Sunlight: Full sun to part shade (best flowering in full sun)
• Soil: Adaptable — performs in sandy, loam and clay soils; ideal for areas with seasonal moisture
• Water Needs: Establishment: 2 deep soaks/week for 8–10 weeks; Established: deep soak every 2–3 weeks in summer; minimal water in winter
• Maintenance: Very low maintenance; Remove spent flower stems and damaged leaves as needed; Divide large clumps every 8–12 years if required
• Lifespan: Very long-lived perennial; commonly 30–50+ years in suitable conditions
• Climate Zones: Ideal for temperate and Mediterranean South Australia, including Adelaide Plains, foothills, and coastal areas
• Soil pH: Broadly tolerant — acid, neutral or alkaline soils

Landscape & Design Ideas

• Feature plant in large gardens and open landscapes
• Mass planting for bold, tropical-style effect
• Ideal near water features, swales and damp zones
• Suits coastal, native and subtropical-style gardens
• Pairs well with Lomandra, Dianella, Agapanthus, Hibiscus, Melaleuca

Why You Will Love It

Crinum pedunculatum is a true garden workhorse — dramatic, fragrant and exceptionally tough. With its glossy evergreen foliage, summer flowers and extraordinary lifespan, it delivers structure and impact in Adelaide gardens with minimal care, even in challenging soils.