Growing Brussels Sprouts: A Complete Profile
By Growing Home Greens Team · July 18, 2026
Brussels sprouts take longer to mature than almost anything else in the vegetable garden, close to a full season from seed to harvest, and they’re one of the few crops that improve with a touch of frost, which converts starches to sugars and softens the bitterness the vegetable is known for.
Starting it early for a long season ahead
Start seed indoors about six weeks before your last frost, same timing as broccoli and cauliflower, but budget for a much longer time in the ground afterward. Sprouts don’t start forming until the plant has built substantial height, and they mature from the bottom of the stalk upward over several weeks. In many climates this makes Brussels sprouts better suited to a fall harvest timed around the first frosts than a summer one.
Small sprouts trace back to nutrition or crowding
Small, loose sprouts are usually a nutrition or spacing problem. Brussels sprouts are heavy feeders and need consistent fertility through their long growing season, and crowding reduces sprout size across the whole stalk. Aphids can build up in the tight sprouts themselves, where they’re hard to rinse out; catching an infestation early, before sprouts close up, is much easier than dealing with it at harvest.
A long-season tenant worth planning around
Onions planted nearby can help confuse the cabbage moths that target Brussels sprouts, but keep it away from tomatoes, the two brassica and nightshade families tend to stunt each other in shared beds. See the full companion guide for brussels-sprouts. At one plant per square foot but occupying a bed for most of a season, the Garden Designer is useful for planning what else that square footage can hold before and after.
Companion planting guide for Brussels Sprouts · Find your planting dates
Typically viable in USDA zones 3-10. Not sure your zone? Look it up by ZIP code.
Method: Start indoors: Start indoors from seed, then transplant outside. Brussels 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 Brussels Sprouts plants fit per square foot?
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.
Soil & water: pH 6.2-6.5. well-drained. Amend with lime if soil pH falls below 6.2.
Varieties worth considering
- Diablo, Divino, and Nautic: A University of New Hampshire Extension variety trial (2013-2021, published 2022) found these three cultivars had the highest yields, most uniform sprouts, and best resistance to Alternaria leaf spot among the varieties tested. (source)
- Jade Cross (F1): Harris Seeds lists this at a compact 85 days and 28 inches tall, notably earlier and shorter than the trial-tested varieties above, with sprouts less prone to wind damage on the shorter stalk. Useful if an early harvest or a windy site is the bigger constraint than raw yield. (source)
- Long Island Improved: A standard garden variety since the 1800s, open-pollinated so you can save your own seed, unlike the F1 hybrids above. At 100 days and a semi-dwarf 48 inches tall, it also fits a smaller garden better than some full-size types. (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 brussels sprout seeds
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See it growing
Search YouTube for "growing brussels sprouts" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Brussels Sprouts: The slowest brassica in the garden, nearly a full season to mature, and better-tasting after a frost, not despite one.
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