Lomandra longifolia (Spiny-headed Mat Rush)
Lomandra longifolia is a hardy, evergreen Australian native grass-like plant valued for its tough, strappy foliage and ability to provide structure and texture in a wide range of landscapes. It is widely used in mass planting, borders, and low-maintenance designs where durability and clean form are essential.
Its resilience and neat clumping habit make it one of the most reliable plants for both residential and commercial projects.
Key Specifications
Botanical name: Lomandra longifolia
Common name: Spiny-headed Mat Rush
Plant type: Evergreen grass-like perennial
Mature height: 60 to 100 cm
Mature width: 60 to 100 cm
Growth rate: Moderate
Time to maturity: Approximately 2 to 3 years
Growth Habit and Structure
Lomandra longifolia forms a dense, clumping plant with arching foliage.
Upright to gently weeping growth habit
Forms rounded clumps from the base
Maintains a clean, structured appearance
Its consistent shape makes it ideal for repetition and large-scale planting.
Foliage and Appearance
The foliage provides strong texture and movement.
Leaves are:
Long, narrow, and strap-like
Mid to deep green in colour
Tough and flexible
The arching leaves create a soft, flowing effect while maintaining structure.
Growth and Establishment
Lomandra longifolia establishes reliably and develops into a dense clump.
Early stage:
Focuses on root development and initial leaf growth
1–2 years:
Forms a full, rounded clump
2–3 years:
Reaches mature size with strong density
Its steady growth ensures consistent results in planting.
Light Requirements
Performs best in full sun to partial shade.
Full sun:
Encourages dense growth and strong form
Partial shade:
Maintains healthy foliage with slightly softer appearance
Suitable for a wide range of environments.
Watering Requirements
Responds well to regular watering during establishment.
During establishment:
Water consistently to support root development
Once established:
Water occasionally depending on conditions
In warmer periods:
Additional watering supports growth
Consistent early watering promotes strong establishment.
Soil Preferences
Performs best in well-drained soil.
Suitable for:
Sandy soils
Loam soils
Improved clay soils
Highly adaptable to a variety of soil types when drainage is adequate.
Pruning and Maintenance
Very low-maintenance and easy to manage.
Minimal pruning required
Older foliage can be removed if needed
Maintains its natural shape without shaping
Ideal for low-maintenance landscapes.
Fertilising
Benefits from occasional feeding.
Apply a slow-release fertiliser if required
Organic mulch can improve soil condition
Supports healthy, vigorous growth.
Flowering Features
Produces small, subtle flower spikes.
Flowers are:
Cream to yellow in colour
Held on short stems within the foliage
The plant is primarily grown for its foliage and structure.
Spacing Guide
For mass planting:
Plant 60 to 80 cm apart
Closer spacing creates faster coverage
Wider spacing allows individual clump form
Landscaping Uses
Lomandra longifolia is ideal for:
Mass planting
Borders and edging
Low-maintenance gardens
Coastal and native landscapes
Commercial and large-scale projects
Its durability and form make it highly versatile.
Longevity and Performance
A long-lasting and reliable plant that performs consistently over time.
Maintains strong structure and foliage
Suitable for long-term planting
Provides year-round greenery with minimal care
Summary
Lomandra longifolia is an evergreen grass-like plant growing to approximately 60–100 cm in height and width. It establishes within 2–3 years, forming dense, rounded clumps of tough, strappy foliage.
Its durability, clean form, and versatility make it an excellent choice for mass planting, borders, and low-maintenance landscape designs.
