Mustard Greens in Zone 10a & 10b
Brassica juncea
When to plant mustard greens in zone 10b
Zones 10a and 10b share the same average frost dates in our data, so this page covers both.
Method: Direct sow: Direct-sow outside. Mustard Greens doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | Jan 9–Jan 16 |
| Estimated harvest | Feb 18–Feb 25 (~40 days after direct-sowing) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Mustard greens are one of the fastest crops you can grow for a full harvest, direct-sown and ready to cut in under six weeks, with a peppery bite that gets sharper the longer a leaf sits on the plant. They're also one of the most cold-tolerant greens, holding up to frost that would finish off lettuce.
How mustard greens fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Mustard Greens needs about 40 days from sowing to first harvest.
Good companions
- Lettuce: Similar light/water needs for a shared salad bed.
- Carrot: Non-competing pairing with mutual pest benefit.
Where to buy mustard greens seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing mustard greens" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 10b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Mustard Greens in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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