California Poppy in Zone 10a & 10b
Eschscholzia californica
Yes, California poppy grows in zones 10a and 10b. Plant it outside Jan 16–Jan 23.
When to plant California poppy 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 16–Jan 23 |
| Estimated bloom | Apr 6–Apr 13 (~80 days after direct-sowing) |
Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 0.5-1 ft.
Plant alongside it in zone 10b
These go outside within two weeks of California poppy in zone 10b, so one planting day can cover them.
- Agrostemma (Corn Cockle)Jan 16–Jan 23
- Bupleurum (Thoroughwax)Jan 16–Jan 23
- CandytuftJan 16–Jan 23
- Corn PoppyJan 16–Jan 23
- Bells of IrelandJan 23–Jan 30
- Clarkia (Farewell-to-Spring)Jan 9–Jan 16
California poppy is a direct-sow-only flower, and not because it's fussy. It's the opposite, thriving on neglect once it's in the ground. It stays under a foot tall, silky cup-shaped orange or yellow blooms over finely cut, blue-green ferny foliage. The catch is that the seed needs light to germinate, so anyone used to burying seed a half-inch deep will bury this one right out of viability.
How California poppy fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. California poppy needs about 80 days from sowing to first bloom.
California Poppy 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 | Bloom |
|---|---|---|---|
| 2a & 2b | Not usually | May 6–May 13 | Jul 25–Aug 1 |
| 3a & 3b | Not usually | May 16–May 23 | Aug 4–Aug 11 |
| 4a & 4b | Not usually | May 1–May 8 | Jul 20–Jul 27 |
| 5a & 5b | Not usually | Apr 26–May 3 | Jul 15–Jul 22 |
| 6a & 6b | Not usually | Apr 11–Apr 18 | Jun 30–Jul 7 |
| 7a & 7b | Not usually | Mar 27–Apr 3 | Jun 15–Jun 22 |
| 8a & 8b | Not usually | Mar 11–Mar 18 | May 30–Jun 6 |
| 9a & 9b | Not usually | Feb 1–Feb 8 | Apr 22–Apr 29 |
| 10a & 10b (your zone) | Not usually | Jan 16–Jan 23 | Apr 6–Apr 13 |
Bloom dates are about 80 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 California poppy.
Where to buy California poppy seeds
True Leaf Market (California poppy seeds)
Varieties we recommend, and where to get them:
- Mikado: Bright red-orange petals over silvery foliage, 12-18 inches, 55-60 days per Hudson Valley Seed. Buy: Botanical Interests · True Leaf Market Full notes
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See it growing
Search YouTube for "growing California poppy" 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 California Poppy in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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