6 named cultivars

grass

Spiny-headed Mat-rush

The Story

Plant Bio

Lomandra longifolia, commonly known as spiny-headed mat-rush, is a robust, tussock-forming perennial herb native to eastern and southern Australia. The plant forms dense, arching clumps of glossy, flat, strap-like leaves that feature distinctive two- or three-toothed tips.

Unlike softer cultivars, the straight species bears highly rigid foliage with sharp, spiny tips that can easily prick unprotected skin. In spring and summer, it produces dioecious, cream to bright yellow flowers clustered in spiny, flattened spikes that sit nestled below the leaf canopy.

Uses & Benefits:

Provides a highly structured, evergreen architectural form with glossy, arching foliage.

Excellent for soil stabilisation and erosion control on steep banks and sandy coastal dunes.

Provides shelter for frogs and small reptiles, supports native bees, and serves as a larval food plant for the Symmomus Skipper butterfly.

Essentials

At a Glance

Plant Type

Grass

Height

39 inches

Width

39 inches

Light

Full Sun, Partial Sun

Zones

8, 9, 10

Water

Low

Humidity

Moderate to high

Lifespan

Perennial

Native To

Eastern and southern Australia

Toxicity

Non-toxic

Planting

How to Grow

Select a planting site in full sun to partial shade with well-drained soil.
Dig a hole twice the width of the root ball and of equal depth.
Position the plant so the crown sits level with the surrounding soil surface, then backfill and firm down.
Water thoroughly to settle the soil, and maintain moderate moisture until the root system is fully established.

Pro Tip

Shearing this plant annually into a tight ball ruins its architectural form and can kill older specimens; instead, cut the clump back to 6 to 15 centimetres once every two to three years to clear out dead thatch.

Keep It Thriving

Care Guide

Do

Cut back the foliage to 6-15 cm every few years in late winter to clear out dead thatch.
Ensure the soil drains freely to prevent root rot in wet periods.
Space plants adequately to maintain good air circulation and prevent leaf spot.

Don't

Do not shear the plant annually into tight spherical shapes.
Do not prune down into old, leafless wood below the crown where buds cannot recover.
Do not apply heavy commercial fertilisers or high-phosphorus feeds.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Fertilize
Pest Check
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Erosion control on banks and slopesMass planting in public open spacesArchitectural borders along low-traffic pathwaysRain gardens and seasonally dry watercourses

Companion Plants

Dianella caerulea Callistemon citrinus Anigozanthos flavidus

Multiply

Propagation Methods

Good to Know

Common Questions

Spiny-headed Mat-rush questions

What zones can Spiny-headed Mat-rush grow in?

Spiny-headed Mat-rush is hardy in USDA Zones 8–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

When does Spiny-headed Mat-rush bloom?

Spiny-headed Mat-rush typically blooms in spring through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Spiny-headed Mat-rush need full sun?

Spiny-headed Mat-rush does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Spiny-headed Mat-rush drought tolerant?

Yes — once established (usually after the first full season), Spiny-headed Mat-rush handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.