Watercress in Zone 10a & 10b
Nasturtium officinale
When to plant watercress in zone 10b
Zones 10a and 10b share the same average frost dates in our data, so this page covers both.
Method: Either: Start indoors for an earlier harvest, or direct-sow outside for less fuss. Watercress tolerates either.
| Start indoors | Jan 9–Jan 16 |
|---|---|
| Direct sow / transplant outside | Jan 16–Jan 23 |
| Estimated harvest | Mar 7–Mar 14 (~50 days after planting) |
Spacing: 9 per square foot (square-foot-gardening spacing). Mature height: 4-10 in.
Watercress is the plant upland cress is compared against and named for, a peppery salad green that shares its flavor but is harder to grow, since it needs constantly saturated soil rather than an ordinary garden bed.
How watercress fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Watercress needs about 50 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Watercress.
Where to buy watercress seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing watercress" 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 Watercress in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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