Start seeds 4 or 5 weeks before last expected spring frost and again in midsummer for a fall crop in mild winter areas. Sow seeds 1 inch apart in a container of seed starting mix, cover lightly, about 1/4 inch deep and keep evenly moist. Provide a strong light source. When seedlings are large enough to handle, gradually acclimate to outdoor conditions, then transplant 24 inches apart into very fertile, well-drained soil in full sun.
Brussels sprouts thrive in rich soil amended with lots of organic matter. Keep growing plants well watered and weeded. Feed at least monthly with all-purpose fertilizer. Use nontoxic B.T. (Bacillus thuringiensis) products to repel caterpillar pests as necessary and wash away aphids if they appear.
HARVEST AND USE
Harvest the main head before florets open by cutting about halfway down the stalk. This will encourage numerous side shoots to form for extended picking from each plant.