Hibbertia spicata 'Ocean Reef'

Ocean Reef Guinea Flower

Botanical Name: Hibbertia spicata ‘Ocean Reef’
Family: Dilleniaceae
Origin: Western Australia coastal selection
Plant Type: Evergreen native groundcover shrub

Overview

Hibbertia ‘Ocean Reef’ is a hardy, low-growing Australian native groundcover prized for its bright yellow buttercup-style flowers and dense, spreading habit. Well suited to Adelaide and South Australian coastal and inland gardens, it thrives in sun, sand and wind, making it an excellent choice for waterwise and exposed landscapes.

Flowering mainly from spring through summer and often sporadically beyond, this variety forms a tight, weed-suppressing mat that adds vibrant colour and year-round structure. Its natural toughness and neat growth make it ideal for slopes, borders and coastal plantings.

Key Features

• Mature Size: 0.3–0.5 m H × 1.0–1.8 m W (low spreading shrub)
• Growth Rate: 25-40 cm per year under good conditions
• Foliage: Small, narrow leaves in mid-green to grey-green tones; evergreen with a slightly leathery texture
• Flowers: Bright golden-yellow 5-petalled blooms; spring–summer peak
  
• Fragrance: Not fragrant
• Seasonal Interest: Evergreen mat with strong spring–summer flowering
• Wildlife Value: Attracts bees and other pollinators
• Tolerance: Excellent drought tolerance once established; Excellent heat tolerance; Very good wind tolerance; Excellent coastal salt tolerance (suited to exposed coastal gardens); Light frost tolerant; Requires well-drained soil; dislikes waterlogging
• Planting Density: Groundcover massing: 2–3 plants per m²; Slopes/embankments: space 0.8–1 m apart
• Pet Friendly: Generally regarded as non-toxic

Where It Works Best

• Sunlight: Full sun for best flowering and dense growth
• Soil: Free-draining sandy, gravelly or loam soils; performs well in coastal limestone and alkaline Adelaide soils
• Water Needs: Establishment: 2 deep soaks/week for 6–8 weeks. Established: deep soak every 10–14 days in summer; monthly in winter if dry
• Maintenance: Very low maintenance; Light trim after flowering to keep dense and tidy; Avoid rich fertilisers; native fertiliser only if required
• Lifespan: 10-20+ years
• Climate Zones: Ideal for Mediterranean and temperate South Australia, especially coastal and exposed sites
• Soil pH: Neutral to alkaline preferred; tolerant of mildly acidic soils if well drained

Landscape & Design Ideas

• Coastal groundcover for banks and dunes
• Spilling over retaining walls and rockeries
• Waterwise borders and native gardens
• Excellent with Westringia, Myoporum, Eremophila, Lomandra
• Useful for erosion control on sunny slopes

Why You Will Love It

Hibbertia ‘Ocean Reef’ is a tough, sun-loving native that carpets the ground with glossy foliage and bright yellow flowers. Perfect for Adelaide’s dry, coastal climate, it provides long-lasting colour and weed suppression with almost no maintenance.