Frequently Asked Questions

Getting started#

How long from planting to first harvest? 9–12 months in the warm tropics, 11–13 months at average management, and 14–20 months in cool subtropical conditions where the cycle stretches. See Growth stages.

How many plants per hectare? At 2.0 × 3.0 m: 1,667. At 2.5 × 3.0 m: 1,333. At 1.8 × 2.5 m: 2,222. Work your own spacing in the density calculator.

What is the best variety? There is no single best. Cavendish for export dessert markets; Lady Finger for cooler sites and local premium sales; French or Horn plantain for cooking; Saba for processing and poor sites. See Varieties.

What is the ideal spacing? 2.0 m within row × 3.0 m between rows for most dessert bananas; 2.5 × 3.0 m for plantain and low-input systems. Triangular offset adds 10–15% more plants at the same spacing.

How deep should I plant the sucker? Corm fully covered with the top of the corm 5–10 cm below soil level. Orientation: buds aligned along the row.

How many suckers should I leave on a mat? One fruiting stem plus one designated follower — the 1 + 1 rule. Remove the rest while they are 15–25 cm tall, every 4–6 weeks.

Sucker or tissue culture? Tissue culture for a new commercial block: uniform, screened, faster to establish. Suckers only from a known-clean, inspected source. See Propagation.

Can bananas grow in pots? Yes. A dwarf clone in a 40–120 L pot in full sun will fruit. See Growing bananas at home.

Can bananas survive frost? No. Foliage is killed at light frost and the growing point dies under a hard freeze. If frost is recorded on the site, it is not a banana site.

Water#

How much water does a banana need? About 1,400–2,000 mm across the cycle, peaking at 6–9 mm/day during flowering and filling — roughly 40–90 litres per mature plant per day.

How often should I irrigate? Every 1–2 days in warm weather at peak demand, every 3–7 days when cool — always enough to wet 30–40 cm deep. Irrigate on soil moisture, not on a calendar alone. See Water management.

Can bananas be grown rainfed? Only where rainfall is 1,200–2,000 mm and evenly distributed with no long dry break. Without reliable dry-season moisture, no.

How long can bananas go without water? They show wilting within days of the top 20 cm drying. Stress during flowering or filling causes permanent yield loss within roughly a week.

Nutrition#

How much fertiliser per plant? A working starting point is 150–250 g N, 40–90 g P₂O₅, 400–700 g K₂O per stem per year, split 4–6 times — but your soil test should set the actual rate. Use the fertiliser calculator.

Which nutrient do bananas need most? Potassium — by a wide margin. It dominates fruit filling and is the highest-demand nutrient.

When do I stop fertilising? Stop nitrogen 4–6 weeks before harvest. Potassium continues through filling.

Why are my banana leaves turning yellow? Work the symptom table: old leaves yellowing between veins = potassium; uniform pale young leaves = nitrogen; interveinal on old leaves = magnesium; stunted pale young leaves = zinc. See Troubleshooting.

Diseases and pests#

Is there a cure for Panama disease (TR4)? No. There is no chemical control and the soil inoculum persists for decades. Exclusion, hygiene and reporting are the only defensible strategies.

What is the most damaging banana disease? Depends on the region. Black Sigatoka is the most widespread yield-sapping disease; Fusarium wilt TR4 and bunchy top are the most existential.

How do I control Sigatoka? Protect leaf area: resistant clone where possible, correct spacing and desuckering for airflow, sanitation, mulch to reduce splash, balanced nutrition, and a FRAC-rotating spray programme driven by a 1–2% affected-leaf-area threshold.

What kills banana plants quickly? Bunchy top virus, bacterial wilt and Fusarium wilt — all spread largely through infected planting material and contaminated tools. Clean material and hygiene prevent all three.

Do bananas need to be sprayed? Not always. Low-pressure sites can rely on resistant clones, sanitation and thresholds. In humid, disease-prone regions a spray programme is the difference between 15 t/ha and 45 t/ha.

How do I know if I have nematodes? Patches of stunting, poor anchorage, toppling plants — confirmed by a lab count from soil and roots. Symptoms alone are easily confused with weevil or drought.

Harvest and post-harvest#

How do I know when to harvest? 75–100 days after flowering (about 90 for Cavendish), with fingers full but still slightly angular, deep green, and a moderate latex flow. Do not harvest on the calendar alone.

How heavy is a banana bunch? 18–30 kg for Cavendish; 10–20 kg for Lady Finger; 25–45 kg for large plantains.

What yield should I expect? Commercial well-managed blocks produce 30–50 t/ha/year for Cavendish; elite export blocks 40–60; subsistence systems 8–20. Plantain 15–40.

How long do bananas last after harvest? Green at 13–14 °C with 90–95% humidity: 2–5 weeks depending on cultivar and maturity. Ripe at ambient: 1–5 days by colour stage.

What temperature should bananas be stored at? 13–14 °C. Below 13 °C causes chilling injury — grey, pitted skin and uneven ripening.

How do I ripen bananas? 80–150 ppm ethylene for 12–24 hours at 14–20 °C, 85–95% RH, then 14–17 °C until the target colour. See Ripening.

Why are my bananas browning at the crown? Crown rot — caused by delay between cutting and washing, ragged cuts and dirty wash water. Cut, de-hand and wash within 4 hours.

Management#

How often should I desucker? Every 4–6 weeks from month 3, and immediately after each harvest.

When do I prop the bunch? Within 1–2 weeks of bunch emergence, before the stem leans. Essential for bunches above 15–20 kg.

How many ratoon crops can I take? Usually 3–4 cycles before yields decline below economic level; fewer on weevil- or nematode-prone sites. The first ratoon is often the best-yielding.

Do bananas need mulch? Yes. 15–20 cm is the target: better moisture, lower weeds, buffered soil temperature, higher organic matter. It is one of the cheapest yield gains available.

Should I remove green leaves? No. Keep at least 7–9 healthy green leaves. Remove only dead, dying or badly diseased leaves.

Can I intercrop bananas? Yes — short, low, early crops such as beans, cowpea, ginger or vegetables. Avoid tall, long-residence competitors and anything that needs heavy irrigation during the banana's flowering window. See Intercropping.

How long does a banana plantation last? 3–4 ratoon cycles (roughly 3–5 years), then renovate — or keep going indefinitely with replanting in stages.

Business#

How much does it cost to start a banana farm? Highly site- and system-dependent; irrigation is usually the swing factor at 15–35% of establishment cost. Model your own figures in the farm budget calculator.

Is banana farming profitable? It can be, with adequate water, clean material, leaf protection and a real market. The most common failure is running out of operating cash between month 6 and first harvest.

What is the single most profitable thing I can do? Protect the leaf canopy. Every green leaf at harvest converts into bunch weight; disease-driven leaf loss is the largest recoverable yield gap in most banana systems.

Do I need certification? Only if your channel requires it or pays for it. Export programmes generally require GLOBALG.A.P. or an equivalent; organic channels require organic certification.