How to grow brussels sprouts
Family Brassicaceae. Hardy to USDA hardiness zone 3a+ (U.S. Department of Agriculture). Full sun. Ready in 90-130 days.
Sun
Full sun
Spacing
18-24 in
Days to harvest
90-130 days
Hardiness
Zone 3a+
What growers actually recorded
Loading zone 7b results…
When to plant brussels sprouts
- Start indoors: ~6 weeks before last frost.
- Transplant out: ~2 weeks after last frost.
Companion plants for brussels sprouts
Plant with: Dill, Onion, Thyme, Beet.
Avoid near: Tomato, Strawberry, Pole bean.
Common pests & problems
Aphid clusters in the sprouts, cabbage worm, cabbage looper.
Feeding & fertilizer
N-P-K ratio: High N (10-5-5): heavy feeders
Organic options: Aged manure or compost worked in deep · Blood meal or feather meal side-dress at 3 wks · Fish emulsion every 2 wks
When to feed: Feed heavily every 2-3 weeks. Brassicas want steady nitrogen for tight heads.
Watch for: Pale/yellow leaves = needs N. Loose heads = feed harder next round.
N = nitrogen (leaves), P = phosphorus (roots and flowers), K = potassium (fruit and disease resistance). How to read a fertilizer label →
Grower's tip
This is a fall crop: frost is what turns the sprouts sweet. Around 4 weeks before harvest, top the growing tip so the plant pushes size into the sprouts.
When to plant brussels sprouts in your zone
Free month-by-month sowing and transplanting lists, built from frost dates for your USDA (United States Department of Agriculture) hardiness zone.
Soil & water for brussels sprouts
Soil & pH
6.5-7.5: near neutral (raises club-root resistance)
Fertile loam with strong drainage. Firm soil beats fluffy for heading brassicas.
Compost 2 in + 1 cup of alfalfa or feather meal per 10 sq ft. Lime if pH is under 6.5. It also blocks club-root.
Watering
1-1.5 in / week, consistent
Ground-level drip. Uneven water during heading = split heads or bolting.
Lift an edge of the row and check soil at 3 inches. If it clings in a damp ball, hold off. If it crumbles, water until the top 6 inches are evenly moist.
Knowing when to harvest
- Sprouts are firm and 1-1.5 in across, starting from the bottom of the stalk upward.
- Snap off lower sprouts by hand once firm; leave upper ones to size up.
- Flavor improves noticeably after a light frost, which converts starches to sugars.
Storing & keeping
Leave on the stalk in a cool garage or refrigerate loose sprouts at 32-40°F, 95% humidity for 3-5 weeks. Blanch and freeze for storage beyond a couple months.
What to expect
Per plant: 1-2 lb, 50-100 sprouts per stalk
Troubleshooting brussels sprouts
Loose, leafy sprouts instead of tight buds
Likely cause: High nitrogen or hot weather during sprout formation
What to do: Reduce late-season nitrogen and grow as a fall-maturing crop timed to size up in cool weather.
Sprouts stay small
Likely cause: Crowded spacing or the plant not topped
What to do: Space 18-24 in apart; pinch out the top growing point 3-4 weeks before first frost to push energy into sprouts.
Aphid colonies inside sprouts
Likely cause: Aphids sheltering between tight leaves
What to do: Soak in salted water before cooking to flush pests, and spray insecticidal soap early in the season.
Varieties worth the space
Not every name in a seed catalog. These are the ones growers order again, with what each one is actually good at and what it asks of you.
Long Island Improved
Heirloom · 100 days
Open-pollinated standard; top the plant in late summer to force even sprouts.
Dagan
Hybrid · 100 days
Strong stalk that stands upright into winter without staking.
Diablo
Vigorous hybrid that holds up well in cold, extending the harvest window.
Falstaff
Red-purple sprouts with distinct color, best for fresh eating.
Growing brussels sprouts in containers
Poor container crop: the tall stalk needs a deep, heavy pot (15+ gallon) and a long, cool season, more than most containers can reliably support.
Nutrition
Sulforaphane, glucosinolates, vitamin K, calcium. Brassicas are the vegetable powerhouse.
Common questions
Should I remove lower leaves as sprouts form?
Yes, once a sprout below a leaf has sized up, snap the leaf off. It redirects energy and improves airflow.
Why do my sprouts taste bitter?
Harvested before frost, Brussels sprouts are notably more bitter. A frost or two sweetens them by converting stored starch to sugar.
Where these numbers come from
- USDA Plant Hardiness Zone Map (2023 revision). Zone assignment and the 30-year normals behind every cold-hardiness figure.
- NOAA NCEI 1991-2020 Climate Normals. Frost dates, growing-season length, and the probability bands on both.
- Cornell, UMN, and UC Davis Cooperative Extension crop guides. Spacing, days to maturity, soil pH targets, and per-plant yield ranges.
- USDA FSIS / FDA Produce Safety guidance. Wash, cure, and cold-storage handling numbers.
Ranges are regional guidance, not a promise for your yard. Your own logged results always override the published range.