How to grow avocado
Overview
Avocado (Persea americana) is a subtropical fruit tree grown for its rich, creamy harvest and long-term garden value. It requires well-drained soil, protection from frost, and consistent moisture to thrive.
Varieties
- Hass — The most popular commercial variety in Australia, with rich, creamy flesh and a long harvest window.
- Shepard — A smooth-skinned, buttery variety that resists fruit fly and ripens earlier than Hass.
- Reed — A large, round fruit with mild flavour, ideal for home gardens in temperate zones.
- Fuerte — A cold-tolerant, pear-shaped variety with thin skin and excellent flavour for coastal areas.
Soil Preparation
Avocado prefers slightly acidic soil (pH 5.5–6.5). Improve drainage with gypsum or coarse sand if clay is present. Add a layer of compost or aged manure before planting, but avoid heavy fertiliser at planting time.
Growing Guide
Plant avocado in full sun with excellent drainage, ideally on a slope or mound to prevent root rot. Space trees 5–8 m apart. Dig a hole twice as wide as the root ball and backfill with native soil; avoid adding compost. Water deeply 2–3 times weekly in the first year, tapering to once weekly once established. Stake young trees in windy spots.
Sowing
Sow fresh seed directly in a pot or ground, pointed end up, at a depth of 2–3 cm. Keep warm and moist; germination takes 2–6 weeks. Seedlings are variable, so grafted trees are preferred for reliable fruit.
Care
Feed with a balanced citrus/avocado fertiliser in early spring and late summer. Prune in winter to remove low branches and improve airflow. Mulch with organic matter but keep 10 cm from the trunk to prevent collar rot.
Companion Planting
Underplant avocado with comfrey, chives, or marigolds to deter pests and improve soil. Avoid planting near eucalyptus or walnut trees, which suppress growth. Keep grass away from the trunk to reduce competition.
Common Pests & Risks
Phytophthora root rot is the main threat—prevent with good drainage and avoid overwatering. Mites and thrips can cause leaf damage; treat with neem oil or predatory mites. Fruit fly may attack; use traps or netting.
Harvesting
Avocados ripen off the tree; pick when fruit feels heavy and skin darkens (for Hass). For green varieties, harvest when fruit reaches full size and begins to soften. Store at room temperature; refrigerate only after ripe.
In the Kitchen
Use ripe avocado in salads, on toast, or as a creamy base for dips. Store cut halves with the pit to slow browning. Mash with lime and salt for guacamole.
Troubleshooting
Yellow leaves: often from overwatering or poor drainage—check soil moisture. Brown leaf edges: caused by salt buildup or dry air—flush soil and increase humidity. Fruit drop: natural in young trees; ensure consistent watering during fruit set. Black spots on fruit: sunburn or fungal—provide shade and prune for airflow.