Flower Sprouts in Zone 4a & 4b
Brassica oleracea
When to plant flower sprouts in zone 4b
Zones 4a and 4b share the same average frost dates in our data, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. Flower Sprouts needs a head start most zones can't give it by direct-sowing alone.
| Start indoors | Apr 3–Apr 10 |
|---|---|
| Direct sow / transplant outside | May 1–May 8 |
| Estimated harvest | Aug 9–Aug 16 (~100 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.
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 fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Flower Sprouts needs about 100 days from transplant to first harvest.
Good companions
No standout companions recorded yet for Flower Sprouts.
Where to buy flower sprout seeds
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 4b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Flower Sprouts in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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