How to grow banana
Overview
Banana (Musa acuminata) is a fast-growing tropical to subtropical plant grown for its bold architectural foliage and sweet fruit. In Australia, it thrives in warm, frost-free microclimates with rich, well-drained soil and regular moisture. Even when fruit set is unreliable, the plant is valued as a striking ornamental.
Varieties
- Dwarf Cavendish — A compact, reliable variety that produces sweet, medium-sized fruit and is well-suited to subtropical gardens.
- Lady Finger — Produces small, sweet, thin-skinned fruit; popular in home gardens for its flavour and disease resistance.
- Goldfinger — A disease-resistant, high-yielding variety with large, firm fruit; ideal for warmer climates.
Soil Preparation
Banana prefers free-draining, rich soil with a pH of 5.5–7.0. Amend with plenty of organic matter, such as compost or well-rotted manure, before planting. Ensure good drainage to prevent root rot; raised beds help in heavy clay soils.
Growing Guide
Plant banana in the warmest, most sheltered spot available, such as against a north-facing wall or fence. Choose free-draining, rich soil with plenty of organic matter. In subtropical and tropical zones, plant after last frost (October–November) and space clumps 2–3 m apart. Mulch deeply (10 cm) to retain warmth and moisture, and protect the pseudostem from frost with hessian or fleece in cooler winters.
Care
Feed monthly from October to April with a high-potassium fertiliser, supplementing with fortnightly liquid seaweed. After the main stem fruits, cut it to the ground and select one or two healthy pups to replace it; remove all others. Remove dead or tattered leaves regularly to reduce disease risk and keep the plant tidy.
Companion Planting
Grow banana alongside other tropical plants like gingers, cannas, taro, and comfrey, which acts as a living mulch and dynamic nutrient accumulator. Avoid planting near other Musaceae where Panama disease is a risk. Comfrey around the base provides continuous organic mulch as leaves decompose.
Common Pests & Risks
Banana weevil borer tunnels into pseudostem bases; inspect regularly and remove affected material. Spider mites and aphids can attack in hot, dry weather; treat with Yates Nature's Way Insect Spray. Slugs and snails damage young shoots; use Baysol pellets around the base. Possums may shred leaves in urban gardens.
Harvesting
Harvest banana bunches when fingers are plump but still green, typically from February to April in subtropical zones. Cut the fruiting stem to the ground after harvest and allow a healthy pup to take over. Ripen fruit indoors at room temperature; do not refrigerate unripe bananas.
In the Kitchen
Harvest bananas when green and ripen indoors at room temperature. Use in smoothies, baking, or eat fresh. Do not refrigerate unripe fruit; store ripe bananas in the fridge for a few days to extend shelf life.
Troubleshooting
Yellow leaves: overwatering or poor drainage; reduce water and improve soil. Brown leaf edges: frost or wind damage; protect with hessian or move to a sheltered spot. Stunted growth: lack of potassium; apply high-potassium fertiliser monthly. Weevil damage: holes in pseudostem base; remove affected material and use beneficial nematodes.