Corn Poppy in Zone 10a & 10b
Papaver rhoeas
Yes, corn poppy grows in zones 10a and 10b. Plant it outside Jan 16–Jan 23.
When to plant corn 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 16–Apr 23 (~90 days after direct-sowing) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Plant alongside it in zone 10b
These go outside within two weeks of corn poppy in zone 10b, so one planting day can cover them.
- Agrostemma (Corn Cockle)Jan 16–Jan 23
- Bupleurum (Thoroughwax)Jan 16–Jan 23
- California PoppyJan 16–Jan 23
- CandytuftJan 16–Jan 23
- Bells of IrelandJan 23–Jan 30
- Clarkia (Farewell-to-Spring)Jan 9–Jan 16
Corn poppy is the classic red field poppy of European farmland, a fast, easy annual that self-sows so readily once established that a single good year of blooms often leads to volunteers coming back on their own.
How corn poppy fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Corn poppy needs about 90 days from sowing to first bloom.
Corn 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 | Aug 4–Aug 11 |
| 3a & 3b | Not usually | May 16–May 23 | Aug 14–Aug 21 |
| 4a & 4b | Not usually | May 1–May 8 | Jul 30–Aug 6 |
| 5a & 5b | Not usually | Apr 26–May 3 | Jul 25–Aug 1 |
| 6a & 6b | Not usually | Apr 11–Apr 18 | Jul 10–Jul 17 |
| 7a & 7b | Not usually | Mar 27–Apr 3 | Jun 25–Jul 2 |
| 8a & 8b | Not usually | Mar 11–Mar 18 | Jun 9–Jun 16 |
| 9a & 9b | Not usually | Feb 1–Feb 8 | May 2–May 9 |
| 10a & 10b (your zone) | Not usually | Jan 16–Jan 23 | Apr 16–Apr 23 |
| 11a & 11b | Not usually | Dec 18–Dec 25 | Mar 18–Mar 25 |
Bloom dates are about 90 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 corn poppy.
Where to buy corn poppy seeds
None of the seed suppliers we list carries corn poppy seeds right now. A local garden center or a specialty seed house is the place to look.
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing corn 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 Corn Poppy in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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