Mandarin — How to Grow Mandarin in Australia

☀️ Sun

Full Sun

💧 Water

Medium

↔ Spacing

400cm apart

↕ Height

Up to 3m

📅 Harvest

365 days

Growing Guide

Plant mandarins in spring (September to November) or early autumn (March to April) when soil temperatures are warm and conditions are mild, avoiding the heat of summer and the cold of mid-winter. Choose a full sun position with at least six hours of direct sunlight daily and protection from strong winds. Prepare soil by digging in compost and well-rotted manure to improve drainage and fertility, as mandarins dislike waterlogged roots. Aim for a soil pH between 6.0 and 7.0, adjusting with lime or sulfur as needed before planting. Water deeply and consistently during establishment — approximately twice weekly in warmer months — then reduce to once weekly once the tree is established. Mulch around the base with sugar cane or lucerne, keeping mulch clear of the trunk to prevent collar rot. Feed with a dedicated citrus fertiliser in late winter (August), late spring (November), and summer (January) to support flowering, fruiting, and healthy growth. Avoid over-fertilising with nitrogen alone, as this encourages leafy growth at the expense of fruit. Harvest mandarins from autumn through winter (April to August depending on variety) when the skin turns fully orange and the fruit feels heavy and separates easily from the branch with a gentle twist. Taste-test before harvesting, as colour alone can be misleading in warmer climates.

🤝 Good Companions

Plant mandarins alongside nasturtiums marigolds borage and comfrey — nasturtiums and marigolds repel aphids and whitefly borage attracts beneficial pollinators to improve fruit set and comfrey acts as a dynamic accumulator drawing deep nutrients to the surface to feed shallow citrus roots.

❌ Avoid Planting With

Avoid planting mandarins near fennel as it releases allelopathic compounds that inhibit citrus root development and overall growth. Keep mandarins away from other large trees and shrubs that compete aggressively for water and nutrients or create heavy shade over the canopy.

🐛 Pests & Diseases

Common pests in Australian mandarin trees include citrus leafminer, bronze orange bug, scale insects, and aphids — control leafminer by encouraging beneficial wasps and removing affected growth, and manage scale and aphids with horticultural oil or neem oil sprays applied in cooler morning conditions. Sooty mould, a black fungal coating, often follows scale or aphid infestations and is best resolved by treating the underlying pest problem and washing foliage with a mild soap solution. Phytophthora root rot can occur in poorly drained soils; prevent it by improving drainage, avoiding overwatering, and keeping mulch well clear of the trunk.

🌱 Fertilising

Feed mandarins with a granular or liquid citrus-specific fertiliser containing nitrogen, phosphorus, potassium, and trace elements — especially magnesium and iron — in late winter, late spring, and midsummer to align with key growth and fruiting stages. In Australian sandy or acidic soils, supplementing with a foliar spray of chelated iron and Epsom salts (magnesium sulfate) helps prevent yellowing leaves and promotes vibrant, productive growth.

✂️ Pruning & Training

Prune mandarins lightly after harvest in late winter to early spring (July to September), removing dead, crossing, or inward-growing branches to open the canopy, improve airflow, and reduce pest and disease pressure. Avoid heavy pruning, as mandarins fruit on mature wood — focus instead on shaping the tree, removing suckers growing below the graft union, and keeping the canopy at a manageable height for easy picking.

🔬 Propagation

Mandarins are best propagated by budding or grafting onto a suitable rootstock such as Trifoliata or Flying Dragon, which controls tree size and improves disease resistance — this is the method used by Australian nurseries to produce reliable, true-to-type trees. Growing from seed is possible but produces variable results, takes many years to fruit, and often lacks the vigour and disease tolerance of grafted trees, so purchasing a grafted specimen from a reputable nursery is strongly recommended for home gardeners.

🗓 When to Plant

Spring Summer Autumn Winter

🌾 Harvest

Winter Spring

🌏 Australian Climates

Subtropical Temperate Cool Temperate Mediterranean

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