Coriander — How to Grow Coriander in Australia

☀️ Sun

Part Shade

💧 Water

Medium

↔ Spacing

20cm apart

↕ Height

Up to 40cm

📅 Harvest

45 days

Growing Guide

Plant coriander in autumn (March–May) or spring (September–November) across most Australian climate zones, as it bolts rapidly in summer heat. In subtropical regions, autumn through winter sowings perform best. Direct sow seeds into the garden rather than transplanting, as coriander dislikes root disturbance. Prepare soil by working in well-aged compost to a depth of 20 cm, aiming for a slightly acidic to neutral pH of 6.0–7.0 with excellent drainage. Sow seeds 1 cm deep and 15–20 cm apart, lightly crushing the seed husks beforehand to improve germination rates. Water seeds in gently and keep the soil consistently moist during germination, which takes 7–14 days. Once established, water moderately — approximately two to three times per week in warm conditions — ensuring soil moisture is maintained but never waterlogged. Mulch around plants to retain moisture and suppress weeds. Apply a diluted liquid fertiliser every three to four weeks to encourage leafy growth rather than bolting. Harvest leaves regularly once plants reach 15–20 cm tall by snipping outer stems at the base, which encourages bushy regrowth and delays bolting. Pinch out any emerging flower stems promptly if you want continued leaf production. For seed harvest, allow plants to flower fully, then collect brown seed heads into paper bags as they ripen, typically six to eight weeks after flowering.

🤝 Good Companions

Coriander grows excellently alongside tomatoes spinach dill and chervil as these companions share similar moisture and part-shade preferences while coriander's flowers attract beneficial predatory insects like lacewings and parasitic wasps that protect neighbouring vegetables from aphids and whitefly.

❌ Avoid Planting With

Avoid planting coriander near fennel as fennel releases allelopathic compounds that inhibit coriander's growth and can cause poor germination; also keep it away from lavender and other Mediterranean drought-tolerant herbs that prefer drier conditions incompatible with coriander's medium water requirements.

🐛 Pests & Diseases

In Australian gardens, coriander is occasionally troubled by aphids, which cluster on tender new growth and can be controlled by blasting with a strong jet of water or applying a diluted neem oil spray. Powdery mildew may appear in humid subtropical conditions or when airflow is poor, so space plants adequately and avoid overhead watering in the evening. Caterpillars from various moth species can also damage foliage and are best managed by hand-picking or applying Bacillus thuringiensis (Bt) spray as an organic control.

🌱 Fertilising

Apply a balanced liquid fertiliser such as seaweed solution or diluted fish emulsion every three to four weeks throughout the growing season to promote lush, leafy growth without triggering premature bolting. Avoid high-nitrogen synthetic fertilisers, which can encourage excessive leafy growth at the expense of flavour and plant resilience in Australian conditions.

✂️ Pruning & Training

Regularly pinch back the growing tips and remove any emerging flower stalks as soon as they appear to redirect the plant's energy into producing fresh foliage and significantly extend your harvest window. Once flowering is desired for seed production, cease pruning entirely and allow the plant to complete its natural lifecycle.

🔬 Propagation

Coriander is propagated exclusively from seed, as it does not divide or strike from cuttings due to its taproot structure; sow seeds directly into their final position every four to six weeks for a continuous succession harvest. Lightly crush the round seed husks to separate the two seeds inside before sowing, which notably improves germination rates and produces more even seedling emergence.

🗓 When to Plant

Autumn Winter Spring

🌾 Harvest

Autumn Winter Spring

🌏 Australian Climates

Temperate Cool Temperate Subtropical Mediterranean

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