Hibiscus ‘Rubra’
Hibiscus ‘Rubra’ is a striking evergreen shrub known for its deep burgundy foliage and bold tropical flowers. It is widely used in feature planting, hedging, and screening where strong colour contrast and a lush, vibrant appearance are desired.
Its rich foliage and showy blooms make it a standout choice for creating impact in both tropical and modern landscapes.
Key Specifications
Botanical name: Hibiscus rosa-sinensis ‘Rubra’
Common name: Rubra Hibiscus
Plant type: Evergreen shrub
Mature height: 2 to 4 metres
Mature width: 1.5 to 3 metres
Growth rate: Moderate to fast
Time to maturity: Approximately 2 to 4 years
Growth Habit and Structure
Hibiscus ‘Rubra’ forms a dense, upright shrub with a naturally bushy habit.
Well-branched and full from the base
Can be shaped into hedges or maintained as a feature shrub
Creates a lush, leafy structure
Its vigorous growth makes it suitable for both screening and decorative planting.
Foliage and Appearance
The foliage is a key feature of this variety.
Leaves are:
Medium-sized and oval-shaped
Glossy with a slightly textured surface
Deep burgundy to reddish-purple in colour
The rich foliage colour provides strong contrast in garden designs.
Growth and Establishment
Hibiscus ‘Rubra’ establishes quickly and develops into a dense plant.
Early stage:
Focuses on root development and initial branching
1–2 years:
Rapid increase in height and density
2–4 years:
Reaches mature size with a full, established form
Its growth rate allows for quick results in landscaping.
Light Requirements
Performs best in full sun.
Full sun:
Enhances foliage colour and promotes flowering
Ideal for open, well-lit positions.
Watering Requirements
Responds well to consistent watering.
During establishment:
Water regularly to support root development
Once established:
Water weekly or as needed depending on conditions
In warmer periods:
Additional watering supports lush growth and flowering
Consistent moisture promotes strong performance and vibrant foliage.
Soil Preferences
Performs best in well-drained soil enriched with organic matter.
Suitable for:
Loam soils
Sandy soils
Improved clay soils
Adapts well to a variety of soil types when properly prepared.
Pruning and Maintenance
Highly responsive to pruning and easy to shape.
Regular trimming encourages dense growth
Ideal for hedging and screening
Can be shaped into formal or informal styles
Pruning promotes bushiness and flowering.
Fertilising
Benefits from regular feeding.
Apply a balanced fertiliser during the growing season
Organic mulch improves soil condition
Feeding supports vigorous growth and flowering.
Flowering Features
Produces large, showy flowers in warm conditions.
Flowers are:
Broad and tropical in appearance
Typically red to deep pink tones
Appear throughout warmer months
The blooms provide bold colour against the dark foliage.
Spacing Guide
For hedging or screening:
Plant 1 to 1.5 metres apart
Closer spacing creates a denser hedge
Wider spacing allows individual plant form
Landscaping Uses
Hibiscus ‘Rubra’ is ideal for:
Hedging and screening
Feature planting
Tropical and subtropical gardens
Colour contrast in garden beds
Courtyards and outdoor living areas
Its bold foliage and flowers make it a focal point.
Longevity and Performance
A reliable, long-lasting shrub that maintains colour and structure over time.
Provides year-round foliage interest and seasonal flowering
Suitable for long-term landscape use
Maintains a dense, vibrant appearance
Summary
Hibiscus ‘Rubra’ is an evergreen shrub growing to approximately 2–4 metres tall and 1.5–3 metres wide. It establishes within 2–4 years, forming a dense plant with deep burgundy foliage and large, colourful flowers.
Its bold colour, fast growth, and versatility make it an excellent choice for hedging, screening, and feature planting in tropical and modern landscapes.
