Growing Flower Sprouts: A Complete Profile
By Growing Home Greens Team · August 10, 2026
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.
Fertile soil, steady water
Best florets come from fertile soil with a pH between 6.5 and 7.5. Fertilize at roughly 75 percent the nitrogen rate used for Brussels sprouts, and irrigate through dry stretches to keep growth even; this crop has a heavier nitrogen appetite than most brassicas here.
Culture matches Brussels sprouts
Start seed indoors about 6 weeks before the last frost, sown a quarter to a half inch deep, then transplant out on the same schedule as Brussels sprouts. The overall plant size and timeline track closely with Brussels sprouts, with the payoff being a more colorful, ruffled harvest at the end.
Flower Sprouts has no recorded companions or antagonists in our data. See the full companion guide for flower sprouts for how it’s tracked. At 1 plant per square foot, it’s a colorful brassica option for the Garden Designer, alongside Kalettes or standard Brussels sprouts for comparison.
Source: Flower Sprouts: Key Growing Information, Johnny’s Selected Seeds.
Companion planting guide for Flower Sprouts · Find your planting dates
Typically viable in USDA zones 2-11. Not sure your zone? Look it up by ZIP code.
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.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Flower Sprouts plants fit per square foot?
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.
Varieties worth considering
- Straight-species Flower Sprouts (Brassica oleracea): Johnny's Selected Seeds sells this as its own trademarked line, a separate breeding program from Kalettes though similar in concept; the culture and floret style are traits of the line itself. (source)
Cited from the source shown next to each variety. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement.
Where to buy flower sprout seeds
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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)
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Growing Flower Sprouts: A separately trademarked kale x Brussels sprouts cross from a different breeding line than Kalettes, with small, ruffled, purple-and-green florets along a tall stalk.
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