What to Plant in September — Temperate Australia
Your complete September planting guide for temperate climate zones. Whether you're in Sydney, Melbourne, or Adelaide, this guide tells you exactly what to sow from seed, plant as seedlings, and harvest this spring.
Covers: Sydney, Melbourne, Adelaide, Perth, Wollongong and surrounding temperate postcodes(2000 (Sydney), 3000 (Melbourne), 5000 (Adelaide), 6000 (Perth))
Temperate Climate — September Overview
Classic four seasons with warm summers and cool winters. Occasional light frosts inland.
September falls in spring for most of Australia, but in temperate zones this means typical seasonal shifts that guide what crops perform best. The recommendations below are calibrated specifically for temperate conditions with local rainfall patterns, temperature ranges, and frost dates in mind.
Sow from Seed
Direct or in punnets
- Tomato (indoors/glasshouse)
- Lettuce
- Spinach
- Radish
- Beetroot
- Carrot
- Peas
- Asian Greens
- Silverbeet
- Beans (end of month)
These crops perform best when direct-seeded or started in seed trays in September for temperate conditions.
Plant as Seedlings
Transplant-ready
- Broccoli (last)
- Tomato (early, frost risk)
- Kale
- Celery
- Leek
- Lettuce
These crops establish faster from nursery seedlings in September. Harden off for 3–5 days before planting out.
Ready to Harvest
From earlier plantings
- Broad Beans
- Peas (first)
- Broccoli
- Cauliflower
- Kale
- Spinach
- Carrot
- Leek
Crops typically ready for harvest in September in temperate zones, from plantings made in previous weeks.
September Tip for Temperate Gardens
Spring arrives but frosts can still occur until mid-October in many temperate areas. Start tomatoes inside. Direct-sow cool-season crops as soil warms above 10°C. Broad bean harvest begins — the first fresh beans of the season.
September Garden Tasks — Temperate Checklist
Soil Preparation
September is an excellent time to refresh beds with aged compost and a slow-release organic fertiliser. In temperate zones, soil pH between 6.0 and 7.0 supports the widest range of vegetables. Test and adjust with lime or sulphur as needed.
Watering Guide
In temperate zones during spring, water deeply and less frequently to encourage deep root systems. Morning watering reduces fungal disease risk. Raised beds typically need watering every 2–3 days in the current season.
Pest & Disease Watch
Transitional spring months in temperate zones bring changing pest dynamics. Cabbage white butterfly activity increases in spring. Check undersides of brassica leaves for green caterpillars. Companion-plant nasturtiums and marigolds to confuse and deter common pests.
Succession Planting
Avoid the feast-or-famine cycle by sowing fast-maturing crops — lettuce, radish, Asian greens, and spinach — every 2–3 weeks rather than all at once. In temperate zones during September, a fortnightly succession-sowing rhythm ensures continuous harvests rather than a single glut. Split your available bed space into thirds and plant each third 2 weeks apart. This applies to salad crops year-round and to beans and beetroot in the warmer months.
From the makers
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This guide is a great starting point — Plant Planner goes further with exact sowing dates, quantities based on your family size, companion planting suggestions, and weekly email reminders.
Why Climate Zone Matters for September Planting
Australia spans five distinct climate zones, and the same calendar month means completely different growing conditions depending on where you live. A gardener in Sydney planting in September faces entirely different challenges and opportunities than someone in a cool alpine area like Canberra or Hobart.
For temperate zones specifically, September is the spring transition — a critical window where the right planting decisions set up your garden for the coming season. The planting recommendations on this page account for typical temperate frost dates, average temperatures, and seasonal rainfall patterns.
For even more precision, VeggiePatch Pro uses your exact Australian postcode to determine your specific microclimate, local frost dates, and the optimal planting windows for your suburb. Enter your postcode for a personalised 12-month planting calendar tailored to your exact location — not just your broad climate zone.
Get a Personalised Plan for Your Garden
This guide is a great starting point, but VeggiePatch Pro goes further. Enter your postcode, your bed measurements, and your family size — we'll generate a complete 12-month planting calendar with exact sowing dates, quantities based on how many people you feed, companion planting suggestions, and weekly email reminders.
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