Myoporum insulare Prostrate

Prostrate Boobialla / Creeping Boobialla

Botanical Name: Myoporum insulare (Prostrate)
Family: Scrophulariaceae
Origin: Australia (coastal southern and eastern Australia)
Plant Type: Evergreen prostrate groundcover shrub

Overview

A tough, fast-growing Australian native groundcover perfectly suited to Adelaide's Mediterranean and coastal climate. Myoporum insulare prostrate form spreads low and wide with dense, glossy bright green succulent-like foliage, creating a hardy evergreen carpet that thrives in the toughest conditions. Small white star-shaped flowers appear in spring and summer, followed by purple berries. Exceptionally salt-tolerant, drought-tough and wind-resistant, it's ideal for coastal gardens, erosion control, embankments, roadside plantings, and water-wise landscapes across South Australia where few other plants can survive.

Key Features

• Mature Size: 20–40 cm H × 2–4 m W (low, spreading prostrate habit)
• Growth Rate: 60–100 cm per year under good conditions (fast lateral spread)
• Foliage: Glossy, bright green succulent-like oval leaves; dense, low-spreading growth; evergreen year-round with consistent colour
• Flowers: Small white star-shaped flowers with purple spots; blooms spring through summer (September–February)
• Fruit: Small purple berries follow flowering in summer and autumn
• Fragrance: Not fragrant
• Seasonal Interest: Evergreen structure year-round with spring–summer flowering and ornamental purple berries
• Wildlife Value: Flowers attract native bees and beneficial insects; berries provide food for native birds
• Tolerance: Exceptional drought tolerance once established; exceptional heat tolerance; frost-hardy (tolerates light to moderate frosts; may show some tip damage in hard frosts but recovers); excellent wind tolerance; exceptional coastal tolerance—highly salt-spray and wind resistant (suitable for front-line coastal positions); tolerates poor, sandy, rocky, and saline soils; moderate tolerance to occasional foot traffic when established
• Planting Density: Groundcover: 1–2 plants per m² for fast coverage; Erosion control/mass planting: 1.5–2.5 m apart
• Pet Friendly: Use caution—leaves and berries may cause mild stomach upset if ingested in quantity; generally not palatable to pets

Where It Works Best

• Sunlight: Full sun to part shade (best growth and flowering in full sun; tolerates light shade)
• Soil: Adapts to almost any well-drained soil—sandy loam, gravelly soil, rocky soil, or poor coastal soils; thrives in saline and coastal limestone soils; excellent drainage preferred but adapts to a range of conditions; avoid heavy waterlogging
• Water Needs:
  • Establishment: Deep soak twice weekly for 6–8 weeks
  • Established: Deep soak every 14–21 days in summer (or less—extremely drought-tolerant); minimal to no watering in winter once established
• Maintenance: Very low maintenance; trim back spreading growth to control size or maintain shape if needed; prune lightly after flowering to encourage dense growth; avoid fertilisers (thrives in lean soils); use low-phosphorus native fertiliser sparingly if desired; virtually pest and disease-free; fast-growing and may require occasional trimming to contain spread in small gardens
• Lifespan: 10–20+ years with minimal care
• Climate Zones: Ideal for Mediterranean and temperate South Australia—Adelaide plains, Fleurieu Peninsula, coastal suburbs, exposed coastal and beachfront properties; thrives in harsh, exposed, and saline sites
• Soil pH: Neutral to mildly alkaline (pH 6.5–8.5); performs exceptionally well on Adelaide's calcareous and coastal limestone soils; tolerates saline soils

Landscape & Design Ideas

• Coastal gardens and beachfront properties—exceptional front-line salt and wind tolerance
• Erosion control on slopes, embankments, dunes, and sandy soils—fast-spreading root system stabilizes soil
• Roadside and median plantings—extreme tolerance to harsh urban and coastal conditions
• Low-maintenance nature strips, verges, and public spaces
• Mass planting in water-wise garden beds for fast evergreen coverage
• Cascading over retaining walls, raised beds, or large planters
• Mixed native gardens with coastal rosemary, westringia, and lomandra
• Firebreak plantings—succulent foliage has moderate fire-retardant properties
• Rehabilitation and revegetation projects in coastal and degraded sites
• Large-scale commercial and industrial landscapes requiring tough, low-water groundcover

Why You Will Love It

Prostrate boobialla is the ultimate Australian native groundcover for Adelaide's toughest coastal and exposed sites. Fast-spreading, evergreen, and virtually indestructible, it thrives in salt spray, poor soils, drought, wind, and heat where most other plants fail. Glossy green year-round, covered in white flowers in spring, and requiring almost zero maintenance—it's the go-to native for extreme coastal conditions and water-wise landscapes.