Flower Sprouts in Zone 11a & 11b
Brassica oleracea
Yes, Flower Sprouts grow in zones 11a and 11b. Start seeds indoors Nov 20–Nov 27 and plant out Dec 18–Dec 25.
When to plant Flower Sprouts in zone 11b
Zones 11a and 11b share the same average frost dates, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. It needs a head start most zones can't give it by direct-sowing alone.
| Start indoors | Nov 20–Nov 27 |
|---|---|
| Direct sow / transplant outside | Dec 18–Dec 25 |
| Estimated harvest | Mar 28–Apr 4 (~100 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.
Plant alongside it in zone 11b
These go outside within two weeks of Flower Sprouts in zone 11b, so one planting day can cover them.
- Gai Lan (Chinese Broccoli)Dec 18–Dec 25
- KalettesDec 18–Dec 25
- KomatsunaDec 18–Dec 25
- Broccoli Rabe (Raab)Dec 11–Dec 18
- MizunaDec 11–Dec 18
- TatsoiDec 11–Dec 18
Flower Sprouts is a separately trademarked kale x Brussels sprouts cross from a different breeding line than Kalettes, though the two are similar in concept: small, ruffled, purple-and-green florets running up a tall stalk instead of the tight round sprouts of a standard Brussels plant.
How Flower Sprouts fit zone 11's season
Zone 11b is frost-free, so frost is not what limits the calendar here. What you can plant, and when, comes down to summer heat and daylength instead.
Flower Sprouts planting windows in every zone
Zone 11b 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 | Apr 8–Apr 15 | May 6–May 13 | Aug 14–Aug 21 |
| 3a & 3b | Apr 18–Apr 25 | May 16–May 23 | Aug 24–Aug 31 |
| 4a & 4b | Apr 3–Apr 10 | May 1–May 8 | Aug 9–Aug 16 |
| 5a & 5b | Mar 29–Apr 5 | Apr 26–May 3 | Aug 4–Aug 11 |
| 6a & 6b | Mar 14–Mar 21 | Apr 11–Apr 18 | Jul 20–Jul 27 |
| 7a & 7b | Feb 27–Mar 6 | Mar 27–Apr 3 | Jul 5–Jul 12 |
| 8a & 8b | Feb 11–Feb 18 | Mar 11–Mar 18 | Jun 19–Jun 26 |
| 9a & 9b | Jan 4–Jan 11 | Feb 1–Feb 8 | May 12–May 19 |
| 10a & 10b | Dec 19–Dec 26 | Jan 16–Jan 23 | Apr 26–May 3 |
| 11a & 11b (your zone) | Nov 20–Nov 27 | Dec 18–Dec 25 | Mar 28–Apr 4 |
Harvest dates are about 100 days after the sow or plant-out date, not after starting seeds indoors.
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
- Radish: Radish (including the daikon form) is a documented trap crop for flea beetles, which prefer its mustard oils over other brassicas and can be sacrificed or pulled once infested: the same research cited on the radish page. (usually zones 2-10, so not a pairing for zone 11b)
Where to buy Flower sprout seeds
None of the seed suppliers we list carries Flower sprout 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 Flower Sprouts" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 11b calendar · Plan your beds in the Garden Designer →
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Growing Flower Sprouts in USDA zone 11b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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