Onion in Zone 10a
Allium cepa
| Start indoors | Aug–Nov |
|---|---|
| Direct sow / transplant outside | Oct–Jan |
| Estimated harvest | ~100 days after transplanting |
Spacing: 9 per square foot (square-foot-gardening spacing).
Zone 10a dates sourced from growinginthegarden.com.
Good companions
- Carrot — Mutual pest confusion between the two root crops.
- Tomato — Onion scent can deter tomato pests.
Where to buy onion seeds
Some links on this page go to retailers we may eventually earn a commission from as an affiliate, at no extra cost to you. We only recommend products with a genuine consensus of positive, independent reviews — see the sources cited on each item.
See it growing
Search YouTube for "growing onion" videos → (a live search, not a hand-picked video — results vary and aren't vetted by us)
← Back to the full zone 10a calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →