Long Island Improved - Brussels Sprout Seeds

Brussels sprouts need a long growing season and are usually most successful as a fall crop. Start seeds indoors about 4–6 weeks before transplanting, then set plants out early enough for the sprouts to mature during cool autumn weather.

Count backward from the variety’s days to maturity and allow extra time as daylight shortens. Most varieties need roughly 85–110 days from transplanting, and light frost often improves their flavor.

Sow seeds about ¼–½ inch deep and provide bright light after emergence. Grow seedlings in cool, steady conditions and harden them gradually before transplanting.

Space plants about 18–24 inches apart, with enough room between rows for airflow and harvest. Use young, sturdy transplants rather than plants that have become crowded or root-bound.

Choose a site with full sun and fertile, well-drained soil enriched with finished compost. Brussels sprouts are in the ground for a long time, so steady growth and balanced fertility are important.

Keep soil moisture consistent, especially as the sprouts begin to swell. Mulch to conserve moisture, suppress weeds, and protect soil structure. Tall plants may need staking in exposed gardens so wind does not loosen their roots or topple the stalks.

Begin harvesting when the lowest sprouts are firm and about 1–2 inches across. Twist or cut them from the stalk and remove the leaf directly below each harvested sprout.

Continue upward as the remaining sprouts mature. Always leave several healthy leaves near the top to support continued growth. Light frost often makes the sprouts firmer, sweeter, and less bitter.

Brussels sprouts provide fiber, folate, potassium, and vitamins C and K. Like other brassicas, they contain carotenoids and naturally occurring glucosinolates.

Roast, steam, sauté, shred raw for slaws, or add them to soups and grain dishes. Small, tightly formed sprouts are often the most tender, while larger sprouts may benefit from being halved before cooking.

Cabbageworms, loopers, aphids, flea beetles, and cutworms may damage young plants or hide among the developing sprouts. Inspect leaves and stalks regularly, remove eggs and caterpillars by hand, and use insect netting early where these pests are common.

Crop rotation, clean beds, good airflow, healthy soil, and watering near the ground help reduce leaf spots, black rot, and other brassica diseases. Avoid planting Brussels sprouts or related crops repeatedly in the same bed.

Brussels sprouts are insect-pollinated biennials and usually flower after winter cold. They cross readily with other Brassica oleracea crops, including cabbage, broccoli, cauliflower, kale, collards, and kohlrabi.

Save seed from several healthy, true-to-type, open-pollinated plants. Grow only one flowering B. oleracea variety nearby or provide generous isolation. Overwinter selected plants in the garden where conditions permit, or lift and store them cool and humid before replanting.

Allow the second-year seedpods to turn tan and begin drying, then cut the stalks before they shatter. Finish drying under cover, thresh, clean, and store the fully dry seed in a cool, dark place.

• Plan primarily for a fall harvest.
• Stake tall plants in windy locations.
• Harvest from the bottom of the stalk upward.
• Leave healthy upper leaves in place.
• Let mature plants experience light frost for the best flavor.