How to grow saltbush
Overview
Saltbush (Atriplex nummularia) is a hardy Australian native shrub grown for its edible silvery leaves and ornamental form. Highly drought-tolerant, it thrives in poor, saline soils and requires full sun with excellent drainage to flourish.
Varieties
- Silver Star — A compact, silver-leaved form ideal for smaller gardens, growing to about 1.5 m tall.
Soil Preparation
Saltbush prefers well-drained sandy or loamy soils with a pH of 7.0–8.5. It tolerates moderately saline conditions, making it ideal for coastal or degraded sites. Improve heavy clay with gypsum or coarse sand. Avoid rich, moisture-retentive soils that promote disease.
Growing Guide
Plant saltbush in full sun in well-draining soil. Space shrubs 1–2 m apart for hedging or 2–3 m as specimen plants. For best establishment, plant in autumn in mediterranean climates or spring in temperate areas. Water deeply but infrequently once established; overwatering causes root rot. It tolerates a wide pH range but prefers neutral to alkaline conditions.
Sowing
Direct sow seeds 5–10 mm deep in spring or autumn, spacing 30 cm apart and thinning to 1 m. Germination takes 14–21 days at 18–25°C; scarify seeds or soak in hot water overnight to improve rates. Can also be grown from semi-hardwood cuttings taken in summer.
Care
Apply a balanced slow-release fertiliser in early spring if growth is slow. Prune lightly after the main harvest in autumn to shape and remove frost-damaged tips. In late winter, cut out dead or weak stems to maintain airflow. Saltbush tolerates moderate pruning; can be cut back hard in spring if needed.
Companion Planting
Pair with drought-tolerant natives like Eremophila, Grevillea, and Westringia, or culinary herbs such as rosemary and sage. Avoid planting near water-demanding species like ferns or impatiens that require frequent irrigation. Saltbush also works well as a windbreak for vegetable beds in coastal gardens.
Common Pests & Risks
Saltbush has few serious pest issues. Scale insects and aphids occasionally appear but rarely cause harm. In some regions, psyllids can cause leaf distortion. Control with horticultural oil or by encouraging beneficial insects like ladybirds. Overwatering may attract root-feeding nematodes in sandy soils.
Harvesting
Harvest young, tender tips (5–10 cm) regularly from spring to autumn to encourage bushy growth. Use fresh in salads or cooking, or dry for later use. Avoid harvesting more than one-third of the plant at a time. Leaves are most flavourful in warm weather before flowering.
In the Kitchen
Saltbush leaves have a salty, earthy flavour. Use fresh in salads, stir-fries, or as a seasoning substitute. Dry and grind leaves to make a salt alternative. Store fresh leaves in the fridge for up to a week or blanch and freeze.
Troubleshooting
Yellow leaves: overwatering or poor drainage; reduce water and improve soil drainage. Brown leaf edges: salt burn from excess fertiliser; flush soil with water. Leggy growth: insufficient sunlight; move to full sun. Stunted growth: saline soil too harsh for young plants; leach with extra water. Leaf drop after frost: prune damaged stems in spring.