Onion at the supermarket
Averaging $2.65/kg right now (24/04/2026)
→ 0.6% per month
Price is stable at 0.6% per month
12-month price history
Monthly average with min/max range band. Data from Woolworths, Coles, Aldi, and IGA.
10 months of data · Last updated: 24/04/2026 22:00
Grow-vs-buy savings
A seed packet or onion sets costs around $5 and should give you roughly 0.15kg after about 6 months in typical home conditions. At today's price of $2.65/kg that's $0.40 worth at the supermarket.
Before you buy: From seed is cheapest; sets (small immature bulbs) are faster. Day-length sensitive — choose varieties matched to your latitude.
Realistic yield: Each onion ~100-250 g. A packet (~200 seeds) yields 20-40 kg at proper spacing.
Ballpark numbers — yield varies by climate, variety, care and luck. Use as a rough indicator, not a business plan.
Today at each retailer
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Real ROI
Based on live-scraped seed prices and measured yield data.
Yield based on a 4 m² home garden bed. Source: NSW DPI Vegetable Growing Guide — Alliums; Gardenate AU. Seed price scraped 18/04/2026.
Pests to watch for
Australian pests and diseases that target onion. Full library.