Broccoli · Perth, WA
A local how-to for Perth’s mediterranean/temperate climate, the planting window, the spacing, the pest pressure, and the family-of-four quantities. Built for raised beds.
The local entry
Plant broccoli in Perth february-may, july-august.
Climate: Mediterranean/Temperate · Spacing: 50 cm · Days to harvest: 80-120 days · Sun: full
Planting window
February-May, July-August
Spacing
50 cm
60 cm rows
Sun
Full sun to partial shade
Water
Moderate to high
Growing broccoli in Perth sits inside a specific window, february-may, july-august, and the success of the crop hinges on respecting it. Perth's mediterranean/temperate climate runs winter lows of about 9°C and summer highs around 35°C, with frost risk: Frost-free (coastal), rare light frosts in hills July-August. Those numbers are the ones every Perth gardener already knows by feel; they're the reason why the same crop behaves differently in a Sydney raised bed compared to a Hobart one.
Start with the bed itself. A raised bed of at least 30 cm depth gives broccoli room for roots to extend, and in Perth, that depth also buffers the soil temperature against the swings that catch out shallow planters. Work compost through the top 20-30 cm until the bed mix is loose and friable. Target a soil pH of 6.0-7.5, which is the band broccoli prefers. If your Perth water is alkaline (which it often is on the mainland), add a handful of sulphur or composted leaves to nudge the pH down. See our raised bed calculator if you’re sizing the bed from scratch.
Perth's dry summers require drip irrigation or soaker hoses rather than overhead watering, conserve water and reduce fungal disease risk simultaneously.
Space plants 50 cm apart, with 60 cm between rows. A standard 1.2 m × 2.4 m raised bed in Perth holds up to 9 broccoli plants at maximum density, though in practice you'll plant 60-70 percent of that to leave room for Dill and Rosemary. Full sun to partial shade. Moderate to high, consistent moisture, especially during head formation. If you want the full plant-by-plant spacing reference, the plant spacing chart is the printable version.
Broccoli is a cool-season crop that requires a long growing period and consistent conditions. In most Australian climates, it is best planted in late summer or autumn for a winter-spring harvest. In cool and highland areas, late winter plantings can succeed if protected from heavy frosts. Start seeds indoors in seedling trays 4-6 weeks before transplanting, or buy established seedlings from nurseries in late summer. Harden off seedlings gradually before transplanting. Plant at 45-50cm spacing, broccoli plants become large and need room for airflow to prevent fungal disease.
In Perth's mediterranean/temperate conditions, broccoli faces the usual seasonal pests but has a long enough productive window to ride them out. Cabbage white butterfly (Pieris rapae) and its green caterpillars are the number-one brassica pest in Australia, use exclusion netting or spray with Bacillus thuringiensis (Bt), a safe biological control. Diamondback moth caterpillars are resistant to many pesticides; use Bt or spinosad. Perth's dry summers require drip irrigation or soaker hoses rather than overhead watering, conserve water and reduce fungal disease risk simultaneously.
Good companions for broccoli in Perth’s climate include Dill, Rosemary, Sage, Thyme. These pairings reduce pest pressure and improve pollination. Keep broccoli away from Tomato, Strawberry, Fennel because they fight for the same nutrients or attract shared pests. The full matrix lives in our companion planting guide.
When it comes to the harvest itself, Harvest the central head when it is tight and dark green, before individual florets begin to open and show yellow flowers. Use a sharp knife to cut the stem at an angle about 15cm below the head. Leave the plant in the ground, side shoots will develop from the leaf axils and provide ongoing harvests for 4-8 weeks. Expect around 200-400g central head plus 200-400g additional from side shoots. For a Perth household of four, Plant 6-8 plants for a family of 4; stagger plantings 3 weeks apart for continuous harvest
Perth gardeners tend to do their best work when they stop treating the year as one long growing season and start treating it as a series of windows. The window for broccoli in your climate is february-may, july-august, set a reminder for the weekend before it opens, get the seedlings in, and the rest is just looking after them.
Perth record
The numbers above sit behind every recommendation on this page. They’re the same climate signal Plant Planner reads from your postcode, see frost dates by city for the longer view.
Plant broccoli in Perth february-may, july-august. Use a raised bed at least 30 cm deep with compost-rich mix, space plants 50 cm apart in rows 60 cm apart, give it full sun to partial shade, and water consistently. Expect 80-120 days from planting to first harvest.
In Perth (mediterranean/temperate climate, frost risk: Frost-free (coastal), rare light frosts in hills July-August), the productive window for broccoli is february-may, july-august. Within that window, planting in the first two weeks gives the longest harvest tail.
Plant 6-8 plants for a family of 4; stagger plantings 3 weeks apart for continuous harvest Expected yield per plant: 200-400g central head plus 200-400g additional from side shoots. Plant Planner runs this calculation against your exact household size when you sign up.
Good companions in Perth include Dill, Rosemary, Sage, Thyme, Celery. These pairings reduce pest pressure and improve pollination in Perth's mediterranean/temperate climate. Keep broccoli away from Tomato, Strawberry, Fennel, they compete for nutrients or attract shared pests.
Full sun to partial shade. In Perth's mediterranean/temperate climate, morning sun and some protection from the harshest afternoon sun in midsummer works best.
Cabbage white butterfly (Pieris rapae) and its green caterpillars are the number-one brassica pest in Australia, use exclusion netting or spray with Bacillus thuringiensis (Bt), a safe biological control. Diamondback moth caterpillars are resistant to many pesticides; use Bt or spinosad. Aphids cluster on new leaves and inside developing heads, check daily and wash off with water. Club root (Plasmodiophora brassicae) is a soil-borne disease causing swollen, distorted roots; lime the soil to maintain pH above 7.0 in affected beds.
Tell us your postcode, family size, and the size of your bed. The planner runs the maths, lays out the bed, and emails you the planting reminders when the weekend before each task arrives.
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