How to grow french bean in Australia
Also known as: Green Bean, Climbing Bean
French beans (also called green beans, common beans, or string beans) are the warm-season counterpart to peas and broad beans. They need warm soil to germinate, hate frost, and produce abundantly through summer when peas have given up. There are two basic types — bush beans that grow into low compact plants and produce all their pods in a few weeks, and climbing beans that scramble up supports and produce continuously over months. Climbing beans give you more total harvest per square metre; bush beans give you a quick crop with less infrastructure.
When to plant
French beans need warm soil (16°C+) to germinate. They're killed by frost and slow in cool weather. Most varieties take 50–70 days from sowing to first harvest.
April to August in the dry season. Wet-season beans rot in the humidity. The dry season suits them well.
August to April. Long warm-season window. Multiple successions through spring, summer, and autumn keep continuous harvest.
September to February. October to November is the main planting window. Succession plantings 3–4 weeks apart extend the harvest through autumn.
October to January. Wait until after Melbourne Cup weekend to avoid late frost. Beans germinate poorly in cool soil — patience is the wrong approach, just wait for warmth.
November to January. Short but productive season in Hobart and Canberra. Choose fast-maturing bush varieties for the best harvest.
August to October, then February for an autumn crop. Beans wilt in extreme heat — aim for spring and autumn harvests rather than fighting peak summer.
Your planting calendar
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French beans are direct-sown — they don't transplant well. Soak seeds for 4–6 hours before sowing to speed germination.
Spacing: Bush beans: 10–15cm between plants in rows 50cm apart. Climbing beans: 15–20cm apart along a trellis or support.
Depth: 3–4cm deep.
Support for climbing types: Install support before or at planting. Options include a teepee of 2m bamboo stakes, a single tall trellis, mesh fencing, or twiggy branches. Climbing beans wind themselves around supports — they don't grip like cucumbers.
Soil: Reasonable garden soil with some compost. Like other legumes, beans fix their own nitrogen — don't over-fertilise. Slightly acidic to neutral pH.
Succession planting: For bush beans, sow a new batch every 3–4 weeks for continuous harvest. Climbing beans produce over a long season without needing succession plantings.
Pots, raised beds, or in-ground?
French beans grow well in all three options.
In-ground is the standard. Climbing beans up a permanent trellis or fence give the largest harvests for the space.
Raised beds suit beans well. The warmer soil helps in marginal climates. Install a trellis at the back of the bed for climbing types, or use bush varieties for self-supporting harvest.
Pots are a real option for both bush and climbing types. A 25–30 litre pot supports 4–6 bush bean plants. Climbing beans need 30+ litres and a 2m+ support installed at planting. Wide rather than deep is fine — beans have shallow roots. Use any reasonable potting mix and water consistently.
Sunlight & water
Full sun — 6 to 8 hours daily.
Water consistently, particularly during flowering and pod set. Beans drop flowers when stressed by dry conditions. Mulch helps.
When and how to harvest
Pick beans when pods are slim, crisp, and the beans inside are small (you should be able to see slight swelling but not feel large beans through the pod). Once beans visibly bulge through the pod, the pod itself gets tough and stringy.
Pick every 2–3 days during peak production. The more you pick, the more the plant produces. Pods left to mature signal the plant to stop producing new flowers.
Beans store about a week in the fridge. They freeze well after blanching, and excess beans can be pickled or dried.
Common problems
Bean fly larvae burrow into stems and cause young plants to wilt or die. Most common in warm humid weather. Plant resistant varieties; net seedlings until established; avoid planting in the same bed two seasons running.
Powdery mildew in humid conditions. Same prevention as elsewhere — good airflow, water at soil level.
Mexican bean weevil can damage stored bean seeds. Freeze seeds for 48 hours after harvest to kill any weevils before storing.
Yellow leaves during heavy fruit production are often a nitrogen issue. Although beans fix their own nitrogen, heavily-cropping plants can run short. A light feed of liquid seaweed solution helps.
Companion planting
Plant near: Carrots, brassicas, corn (climbing beans use corn as a support — three sisters), cucumber, lettuce, marigold.
Keep away from: All alliums (same legume-allium issue), fennel, beetroot (for climbing beans only).
Australian varieties
Borlotti — Italian heritage variety with red-streaked pods. Eat fresh as a green bean when young, or shell mature beans for cooking. Climbing habit. Excellent flavour.
Purple King — Climbing variety with purple pods that turn green when cooked. Productive and decorative. Reliable across most climates.
Blue Lake — Classic climbing green bean. Long stringless pods. The standard reliable variety for home gardens.
Hawkesbury Wonder — Australian bush variety. Productive and reliable. Faster-maturing than climbing types.
Tendergreen — Bush variety, fast-maturing, sweet flavour. Good for short-season climates.
Scarlet Runner — Climbing bean with bright red flowers. Beans are edible young; older beans are starchy and best dried. Decorative and edible.