Fresh broccoli head growing in an Australian garden bed

How to Grow Broccoli in Australia

Varieties, planting times, and the trick to harvesting side shoots for weeks

Broccoli is one of the most rewarding winter crops you can grow. A single plant produces a large central head, and if you harvest it correctly, the plant keeps pushing out side shoots for weeks afterwards. That means fresh broccoli from one planting for up to two months.

This guide covers the best varieties for Australian gardens, planting times for all 10 regions, and how to get the most from every plant.

Your region

When to Plant in Your Region

Best Broccoli Varieties

Green Sprouting Calabrese

The standard broccoli. Large central head followed by weeks of side shoots. Reliable in all Australian regions.

Di Cicco

Italian heirloom, produces many medium side shoots rather than one large head. Great for continuous harvest over 6 to 8 weeks.

Purple Sprouting

Hardy variety with purple florets that turn green when cooked. Tolerates colder conditions than green types. Excellent flavour.

Romanesco

Stunning fractal-shaped heads with a mild, nutty flavour. Slower to mature (90 to 100 days) but worth the wait. Performs best in cooler regions.

Starting Seedlings

Sow broccoli seeds in trays or punnets about 6 weeks before you plan to transplant them into the garden. Seeds germinate at temperatures between 10 and 30 degrees, but cooler conditions produce sturdier seedlings.

Fill trays with a good quality seed-raising mix and sow seeds 1 cm deep. Keep the mix moist but not waterlogged. Seedlings should emerge in 5 to 10 days.

Tip: Start seeds in a cool, bright spot rather than full sun. Broccoli seedlings that get too warm and leggy are more likely to bolt after transplanting.

Transplanting

Transplant seedlings into the garden when they have 4 to 6 true leaves. Space plants 40 to 50 cm apart in rows, giving them plenty of room to develop large heads.

Firm the soil around the roots and water each plant in well. Broccoli has shallow roots, so a good watering at transplant time helps them establish quickly.

Tip: Transplant in the late afternoon or on a cloudy day to reduce transplant shock. Water seedlings thoroughly in their trays a few hours before planting out.

Growing Tips

Broccoli grows best in full sun with rich, well-drained soil. It is a hungry plant that needs consistent moisture and regular feeding to produce large heads.

Prepare beds with compost and aged manure before planting.
Keep soil consistently moist. Irregular watering leads to small, loose heads.
Side-dress with a nitrogen-rich fertiliser every 3 weeks during the growing period.
Mulch around plants to retain moisture and suppress weeds.
Avoid planting where other brassicas (cabbage, cauliflower, kale) have grown in the last 2 to 3 years.

Harvesting

Cut the central head when it is tight, firm, and dark green. Harvest before the individual buds start to open into yellow flowers. Use a sharp knife and cut the stem at an angle about 15 cm below the head.

Leave the plant in the ground after cutting the main head. Side shoots will develop from the leaf joints over the following weeks. These smaller florets are just as good to eat and will keep producing for 4 to 8 more weeks if you pick them regularly.

Tip: Check plants every 2 to 3 days once the head starts forming. Broccoli can go from perfect to flowering in just a few warm days.

Common Problems

Cabbage moth caterpillars

White butterflies (cabbage moths) lay small yellow eggs on the undersides of broccoli leaves. The green caterpillars that hatch can strip a plant quickly. Check plants regularly and pick off caterpillars by hand. Exclusion netting is the most reliable prevention and keeps butterflies from reaching the plants entirely.

Aphids

Grey-green aphids cluster on growing tips and the undersides of leaves. Blast them off with a strong jet from the hose. Check plants regularly, especially in the crevices of forming heads. Ladybirds and hoverflies are natural predators, so avoid broad-spectrum sprays.

Bolting

Broccoli bolts (flowers prematurely) when stressed by heat, inconsistent watering, or transplant shock. Plants that bolt produce small, bitter heads. Choose bolt-resistant varieties for warmer regions and keep watering consistent throughout the growing season.

Track Your Broccoli Growing

Add broccoli to your garden in the Planting Season app and get reminders for sowing, transplanting, and harvest time.

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Frequently Asked Questions

When should I plant broccoli in Australia?

Broccoli is a cool-season crop. In most regions, sow seeds or transplant seedlings from late summer through autumn for a winter and spring harvest. In tropical and subtropical areas, plant during the dry season (April to July). Check the regional calendar above for your specific planting window.

How long does broccoli take to grow?

Broccoli takes 10 to 16 weeks from transplanting to harvest, depending on variety and conditions. After cutting the central head, side shoots will continue producing for another 4 to 8 weeks.

Why is my broccoli going to flower?

Broccoli flowers (bolts) when stressed by heat, inconsistent watering, or transplant shock. The heads open into yellow flowers and become bitter. Harvest the central head while the buds are still tight and green. Choose bolt-resistant varieties if you garden in a warmer region.

Can I grow broccoli in summer?

Broccoli struggles in hot weather and will bolt quickly in summer heat. In most Australian regions, it grows best from autumn through spring. In cooler areas like Tasmania, the Southern Highlands, or elevated parts of Victoria, summer planting may work if temperatures stay below 25 degrees consistently.