Upland Cress in Zone 10a & 10b
Barbarea verna
Yes, upland cress grows in zones 10a and 10b. Plant it outside Jan 23–Jan 30.
When to plant upland cress in zone 10b
Zones 10a and 10b share the same average frost dates, so this page covers both.
Method: Direct sow: Direct-sow outside. It doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | Jan 23–Jan 30 |
| Estimated harvest | Mar 14–Mar 21 (~50 days after direct-sowing) |
Spacing: 9 per square foot (square-foot-gardening spacing). Mature height: 4-8 in.
Plant alongside it in zone 10b
These go outside within two weeks of upland cress in zone 10b, so one planting day can cover them.
- TomatoFeb–Apr
- Sweet CornFeb–Mar
- CucumberFeb–Apr
- ZucchiniFeb–Mar
- BroccoliniJan 30–Feb 6
- Flower SproutsJan 16–Jan 23
Upland cress delivers watercress's peppery flavor without watercress's constant-moisture growing requirements, since it grows in ordinary garden soil rather than needing a bog-like bed or running water.
How upland cress fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Upland cress needs about 50 days from sowing to first harvest.
Upland Cress planting windows in every zone
Zone 10b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 2a & 2b | Not usually | May 13–May 20 | Jul 2–Jul 9 |
| 3a & 3b | Not usually | May 23–May 30 | Jul 12–Jul 19 |
| 4a & 4b | Not usually | May 8–May 15 | Jun 27–Jul 4 |
| 5a & 5b | Not usually | May 3–May 10 | Jun 22–Jun 29 |
| 6a & 6b | Not usually | Apr 18–Apr 25 | Jun 7–Jun 14 |
| 7a & 7b | Not usually | Apr 3–Apr 10 | May 23–May 30 |
| 8a & 8b | Not usually | Mar 18–Mar 25 | May 7–May 14 |
| 9a & 9b | Not usually | Feb 8–Feb 15 | Mar 30–Apr 6 |
| 10a & 10b (your zone) | Not usually | Jan 23–Jan 30 | Mar 14–Mar 21 |
| 11a & 11b | Not usually | Dec 25–Jan 1 | Feb 13–Feb 20 |
Harvest dates are about 50 days after the sow or plant-out date.
Zone 2 sows before zone 3 here, which looks wrong and is not. USDA zones rank winter cold, not season length, and zone 2 is mostly interior Alaska, where hard winters come with warm summers. More on what a zone measures.
Good companions
No well-established companions for upland cress.
Where to buy upland cress seeds
High Mowing Organic Seeds (each supplier's upland cress seeds)
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing upland cress" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 10b calendar · Plan your beds in the Garden Designer →
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Growing Upland Cress in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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