Growing Spring Onion in Australia: The Complete Guide

Spring Onion is an easy bulb & allium to grow, needing full–part sun with regular watering.

If you're thinking about adding spring onion to the homestead, here's the detail behind our printable guide — what it actually takes to grow it well in an Australian garden, not just the quick-reference version.

Every crop earns its place in a garden differently, and spring onion is no exception. At a glance, it's rated easy, with a sun of full–part sun; water of regular; soil ph of 6.0–7.0 — details that matter more once you're actually planning around them than they do on a first read. The rest of this article works through exactly what each of those means day to day, in more depth than a single printable card has room for, and with the reasoning behind each recommendation rather than just the recommendation itself.

Climate and Timing Considerations

Australia's climate zones change growing timing more than most general advice accounts for. Cool temperate zones (Tasmania, the Victorian highlands, southern NSW) have recurring frost risk well into what other zones call spring, which compresses the safe planting window for frost-tender plantings. Warm temperate zones (Sydney, Adelaide, Melbourne, Perth) sit closest to what general advice assumes by default. Subtropical zones (Brisbane, northern NSW) rarely see frost at all, and the growing calendar shifts earlier and later as a result. Our site-wide zone setting adjusts the advisory note shown on the Planting Calendar for exactly this reason — worth setting once if you haven't already. The same zone setting also feeds the Harvest Calendar, so both ends of the growing cycle reflect wherever you actually garden, rather than a generic Australia-wide average.

• Cool Temperate (TAS, VIC highlands, southern NSW, ACT): shorter frost-free window — lean toward the later end of any spring planting window shown on the guide above.
• Warm Temperate (Sydney, Adelaide, Melbourne, Perth, coastal NSW/WA): closest match to the general timing shown above; frost is occasional but rarely severe.
• Subtropical (Brisbane, northern NSW, coastal QLD): minimal frost risk — often plantable a few weeks earlier and later than the general window shown above.

Harvested before bulbing

Spring onions are simply pulled young, before a true bulb forms — a fast, low-effort crop that can be tucked into gaps between slower-growing vegetables.

Preserving. See Root Cellaring for curing and storing alliums beyond the basics above.

Getting Spring Onion Into the Ground

Method. Direct sow thickly in a short row or block.

Soil. Loose, well-drained, moderately fertile.

Timing. Sow year-round in mild zones for a continuous supply.

Taken together, these are the details that separate a smooth result from a frustrating one.

Day-to-Day Care

Worth paying attention to:

• Succession sow every few weeks for a steady harvest.
• Keep soil evenly moist.
• Harvest by pulling every second plant to let others size up.
• Feed lightly if growth looks slow.

Getting these details right matters more than it might seem — succession sow every few weeks for a steady harvest. Feed lightly if growth looks slow. Treat this list as a routine to build rather than a one-off checklist, and it becomes second nature within a season or two.

What Can Go Wrong

Keep these points in mind:

• Onion thrips — silvery streaking; hose off.
• Rust — orange spotting; improve airflow.
• Damping off — young seedlings in wet, cool soil; avoid overwatering seedlings.
• Bolting — less of an issue since harvested young.

Each of these compounds over a season — small misses early tend to show up later — onion thrips — silvery streaking; hose off. Bolting — less of an issue since harvested young. Treat this list as a routine to build rather than a one-off checklist, and it becomes second nature within a season or two.

Harvest and Storage

Signs. Usable from pencil-thickness onward.

Method. Pull by hand, whole plant.

Curing. None needed.

Storage. Fridge crisper, about a week.

It's worth reading these as a set rather than in isolation; they reinforce each other.

Companions & rotation

Our printable card above lists specific plants that pair well nearby and others best avoided, along with a rotation note: Carrot, Tomato, Lettuce, Beans, Peas. Getting this right matters more over multiple seasons than it does in any single one — the benefits and the risks of poor rotation both compound over time rather than showing up immediately.

Related Guides

If spring onion suits your garden, these related guides in the same category are worth a look too:

• Elephant Garlic
• Garlic
• Leek
• Onion

For the condensed, printable version of everything above, head to the main spring onion guide page. Companion planting and bed rotation both make a measurable difference over a season, and our Companion Planting Checker takes the guesswork out of both. As with every guide on this site, this is general information based on our own research and experience, not professional advice — your specific soil, climate, and circumstances will always vary from ours to some degree.

Beyond the printable card, our Planting Calendar and Harvest Calendar tools will show a zone-adjusted note for spring onion specifically, and the Companion Planting Checker covers the specific pairings mentioned above in more detail.

Frequently Asked Questions

→ View the printable A4 guide for spring onion