How to grow kangaroo grass
Overview
Kangaroo grass (Themeda triandra) is a perennial native tussock grass found across Australia, grown for its fine-textured foliage, gentle movement in the wind, and structural role in naturalistic and meadow gardens. It is highly drought-tolerant once established and provides year-round interest with its blue-green leaves that turn reddish-bronze in cooler weather.
Varieties
- Themeda triandra 'Mingo' — A compact, low-growing selection from Victoria, ideal for small gardens and groundcover.
- Themeda triandra 'Kangaroo' — A robust, taller form with excellent drought tolerance, often used in meadow-style plantings.
Soil Preparation
Prefers well-drained sandy loam or gravelly soil with a pH of 5.5–7.5. If planting in heavy clay, incorporate 10–15 cm of coarse sand or decomposed granite to improve drainage. No additional organic matter is needed — it thrives in lean soils.
Growing Guide
Sow seeds in spring (or autumn in Mediterranean zones) directly into well-drained soil at a depth of 5–10 mm, spacing 30–50 cm apart. For faster establishment, plant tube-stock or small clumps in early to mid-spring after the last frost. Full sun is essential; light shade reduces flowering and density. Avoid heavy clay or waterlogged sites — if soil is poor, add coarse sand or gravel to improve drainage. Water regularly for the first 8–12 weeks until roots are established, then reduce to occasional deep watering during extended dry periods.
Sowing
Sow seeds 5–10 mm deep in seed trays or direct in the garden. Germination takes 14–28 days at 18–25°C. Direct sowing is easiest; transplanting is possible but avoid disturbing the root ball. Seeds benefit from a 2–4 week cold stratification (in the fridge) if sowing in cool zones.
Care
Apply a low-nitrogen native fertiliser (e.g., slow-release pelletised native food) in early spring at half the recommended rate. Cut back old foliage to 10 cm in late winter to rejuvenate the clump and remove dead material. Divide clumps every 3–4 years in early spring to maintain vigour and prevent centre dieback.
Companion Planting
Pair with other low-water natives such as Lomandra longifolia, Dianella revoluta, Poa labillardieri, and Chrysocephalum apiculatum. Avoid planting near aggressive exotic grasses like Pennisetum setaceum or Paspalum that may outcompete or hybridise with it.
Common Pests & Risks
Generally pest-free, but may occasionally be affected by grasshoppers or caterpillars that chew the foliage. In humid areas, watch for rust fungus (Puccinia species) on leaves — improve air circulation and avoid overhead watering. No chemical control is usually needed.
Harvesting
Kangaroo grass is not harvested for culinary use; it is grown purely as an ornamental or for ecological restoration. If collecting seed for propagation, harvest the ripe seed heads in late summer when they turn a golden-brown colour and begin to detach easily.
Troubleshooting
Yellowing leaves: usually caused by overwatering or poor drainage — reduce watering and check soil. Brown leaf tips: common in dry spells — not a problem, but deep water once a week if prolonged. Centre dieback: clump becomes too old — divide every 3–4 years. Sparse growth: too much shade — move to full sun. Rust spots: humid conditions — improve airflow and avoid wetting foliage.