Ranunculus in Zone 10a & 10b
Ranunculus asiaticus
Yes, ranunculus grows in zones 10a and 10b. Plant it outside in Oct–Nov. For a fall crop, plant out in Oct–Nov.
When to plant ranunculus 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.
| Window | Fall window |
|---|---|
| Start indoors | Not typically started indoors |
| Direct sow / transplant outside | Oct–Nov |
| Estimated bloom | ~105 days after direct-sowing |
| Window | Spring window |
|---|---|
| Start indoors | Not typically started indoors |
| Direct sow / transplant outside | Feb–Mar |
| Estimated bloom | ~105 days after direct-sowing |
Spacing: 5 per square foot (square-foot-gardening spacing). Mature height: 1-1.5 ft.
Zone 10b dates sourced from growinginthegarden.com.
Fall window: the last sowing date is the average first frost minus days to maturity, the method in Purdue Extension's fall garden guide, which lists ranunculus for late-summer planting.
Plant alongside it in zone 10b
These go outside within two weeks of ranunculus in zone 10b, so one planting day can cover them.
- NasturtiumOct–Jan
- Black-Eyed SusanOct–Mar
- HollyhockOct–Mar
- Love-in-a-Mist (Nigella)Oct–Mar
- Pansy / ViolaOct–Jan
- StrawflowerOct–Feb
Ranunculus produces some of the most densely petaled, rose-like blooms of any corm in this group, but it comes with a genuine climate split: gardeners in mild-winter zones plant it in fall like the hardy bulbs, while everyone in colder zones plants it in spring instead.
How ranunculus fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Ranunculus goes in during the fall and grows through the winter, so it isn't limited by this window: expect first bloom about 105 days after planting.
Ranunculus 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 13–May 20 | Aug 26–Sep 2 |
| 3a & 3b | Not usually | May 23–May 30 | Sep 5–Sep 12 |
| 4a & 4b | Not usually | May 8–May 15 | Aug 21–Aug 28 |
| 5a & 5b | Not usually | May 3–May 10 | Aug 16–Aug 23 |
| 6a & 6b | Not usually | Apr 18–Apr 25 | Aug 1–Aug 8 |
| 7a & 7b | Not usually | Apr 3–Apr 10 | Jul 17–Jul 24 |
| 8a & 8bFall window | Not usually | Oct–Dec | ~105 days after direct-sowing |
| 9a & 9bFall window | Not usually | Oct–Dec | ~105 days after direct-sowing |
| 10a & 10bFall window (your zone) | Not usually | Oct–Nov | ~105 days after direct-sowing |
| Spring window | Not usually | Feb–Mar | ~105 days after direct-sowing |
Bloom dates are about 105 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 ranunculus.
Where to buy ranunculus bulbs
We haven't vetted bulb/tuber suppliers yet. Our seed-supplier list below doesn't carry these. The growing-guide source cited above is a good starting point for where to buy.
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See it growing
Search YouTube for "growing ranunculus" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Ranunculus in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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