Yucca desmetiana

Soft Leaf Yucca / Spellbound Yucca / Spineless Jade Agave / De Smet's Yucca

Botanical Name: Yucca desmetiana
Family: Asparagaceae
Origin: Americas
Plant Type: Evergreen succulent (soft-leaf yucca)

Overview

A striking, spineless yucca that loves Adelaide’s heat and low rainfall, Yucca desmetiana delivers bold, architectural form with colour-shifting foliage. Leaves arch gracefully from a tidy clump, turning dusky plum to burgundy in cold or high sun, then easing back to blue-green/olive in milder weather. Creamy white flower spires may rise in summer, adding a touch of evening perfume and drama.

Key Features

• Mature Size: 0.8–1.2 m H × 0.6–1.0 m W (clump); flower spike to ~1.5 m when in bloom
• Growth Rate: 20-40 cm per year under good conditions
• Foliage: Soft, spineless, arching leaves—safer near paths than spiky yuccas
• Flowers: Blue-green to olive most of the year; develops burgundy/purple tones in winter cold, high light, and dry conditions; new growth emerges brighter green, older leaves deepen to dusky plum
  
• Seasonal Interest: Evergreen structure with seasonal colour shift; summer flower spikes on mature clumps
• Wildlife Value: Night-scented blooms can attract moth pollinators; drought habitat cover for lizards/beneficials
• Tolerance: Highly drought & heat tolerant once established; coastal & wind tolerant; handles light frost (~-5 °C) if soil drains well
• Planting Density: Specimen/accent: 1 per 0.8–1 m • Mass planting: 1–2 plants per m² for a sculptural, low-water swathe
• Pet Friendly: Toxic if ingested (saponins); foliage is spineless but still discourage chewing

Where It Works Best

• Sunlight: Full sun to light part shade (strongest colour in full sun)
• Soil: Free-draining sandy/loam/gravel; thrives in raised beds and rocky pockets; avoid waterlogging
• Water Needs: Establishment: 2 deep soaks/week for 8–12 weeks. Established: deep soak every 2–4 weeks in summer (more in heatwaves); usually none in winter if rainfall adequate
• Maintenance: Remove spent flower stalks and the occasional oldest leaf; do not over-fertilise (keeps form tight and colours rich); refresh mulch in spring
• Lifespan: 15-25+ years
• Climate Zones: Excellent in temperate & Mediterranean SA, including coastal suburbs
• Soil pH: Slightly acidic to mildly alkaline; tolerates limestone soils if drainage is sharp

Landscape & Design Ideas

• Container star in 50–60 cm+ pots for courtyards and poolside; pair with blue chalk sticks, lomandra, westringia or ornamental grasses
• Mass plant along hot north/west aspects for a low-maintenance, colour-shifting ribbon that thrives on neglect
• Contrast planting: set against silver foliage (Dichondra ‘Silver Falls’) or coppers/bronzes (Alyogyne, Coprosma) to echo its winter burgundy tones

Why You Will Love It

Year-round architectural impact with chameleon-like foliage that shifts from cool blue-greens to rich burgundy in Adelaide’s seasons. It’s ultra-tough and low-water, spineless (friendlier near walkways), and needs only the lightest touch to look amazing for years.