Mint — How to Grow Mint in Australia

☀️ Sun

Part Shade

💧 Water

Medium

↔ Spacing

30cm apart

↕ Height

Up to 50cm

📅 Harvest

60 days

Growing Guide

Mint is best planted in spring (September–November) or autumn (March–May) across most Australian regions, when temperatures are mild and establishment is rapid. In subtropical areas, autumn planting is particularly successful, avoiding the harshest summer heat and humidity. Choose a position with morning sun and afternoon shade — especially important in hotter Australian climates where full sun can scorch leaves. Prepare soil by incorporating well-aged compost or organic matter to improve moisture retention, as mint prefers consistently moist but well-drained conditions. A slightly acidic to neutral pH of 6.0–7.0 is ideal. Water regularly, aiming to keep soil evenly moist — never waterlogged. During Australian summers, potted mint may need daily watering, while garden-bed plants typically require watering every two to three days depending on conditions. Apply a layer of organic mulch around the base to conserve soil moisture and suppress weeds. Feed lightly every four to six weeks during the growing season with a balanced liquid fertiliser to encourage lush, productive foliage. Begin harvesting once plants are well established and at least 15 cm tall — pinch stems just above a leaf node to encourage bushy regrowth. Harvest frequently for the best flavour, ideally in the morning after dew has dried. Cut back flowering stems promptly to maintain leaf quality and delay going to seed.

🤝 Good Companions

Mint grows exceptionally well alongside tomatoes brassicas (such as cabbage and broccoli) and peas as its strong volatile oils help repel aphids cabbage moths and whitefly reducing pest pressure on vulnerable crops. Planting mint near roses can also deter aphids while attracting beneficial pollinators to the garden.

❌ Avoid Planting With

Avoid planting mint near chamomile or parsley as mint's vigorous spreading root system can overwhelm and outcompete these more delicate herbs stunting their growth. It is generally best kept away from most herbs in open ground unless contained as it will aggressively colonise surrounding soil.

🐛 Pests & Diseases

In Australian gardens, mint is occasionally troubled by aphids, spider mites, and the mint beetle, which can skeletonise leaves during warm months. Powdery mildew and rust are the most common fungal issues, particularly during humid subtropical summers or when airflow is poor. Control aphids and mites with a strong water spray or diluted neem oil solution, improve air circulation by thinning crowded stems, and treat fungal issues with an organic potassium bicarbonate spray.

🌱 Fertilising

During the growing season (spring through autumn), feed mint every four to six weeks with a balanced liquid fertiliser such as a seaweed and fish emulsion blend, which promotes lush leaf growth without excessive nitrogen burn. Avoid heavy synthetic fertilising, as it can reduce the concentration of essential oils responsible for mint's signature aroma and flavour.

✂️ Pruning & Training

Prune mint regularly by cutting stems back by one-third to one-half, particularly after flowering, to stimulate fresh bushy growth and prevent the plant from becoming woody and straggly. In late winter (June–August), cut established plants back hard to ground level to rejuvenate them and encourage a flush of vigorous new growth in spring.

🔬 Propagation

Mint is most reliably and quickly propagated by division — simply dig up an established clump in spring or autumn, separate the root runners into sections, and replant immediately at the same depth. Stem cuttings also strike readily; place 10–15 cm cuttings in a glass of water on a bright windowsill and pot them up once roots reach 2–3 cm in length, usually within two weeks.

🗓 When to Plant

Spring Summer Autumn Winter

🌾 Harvest

All

🌏 Australian Climates

Temperate Cool Temperate Subtropical Mediterranean

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