Botanical Name: Brassica oleracea var. botrytis
Days to Maturity: 75–120 days
Hardiness: Frost-tolerant biennial grown as an annual
Plant Dimensions: 12"–24" tall and wide
Variety Information: Compact heads averaging about 6" in diameter and 2–3 pounds composed of undeveloped flower buds; the flowers are attached to a central stalk. 'Early Snowball' is a dwarf plant with compact white heads. 'Cauliflower of Macerata' is a vigorous grower with green heads. 'Sicilian Purple' has bright purple heads, is more pest resistance, and is hardier and easier to grow than other varieties.
Attributes: Good for Containers
When to Sow Outside: Not recommended. 1 to 2 weeks before your average last frost date, or 10 to 12 weeks before your average first fall frost date. In Mild Climates, sow in early fall for winter harvest.
When to Start Inside: RECOMMENDED. 4 to 6 weeks before transplanting outside after your average last frost date, or 12 weeks before your average first fall frost date. In mild climates, sow in fall for harvest in late winter and early spring. Ideal soil temperature for germination is 70°–85°F, with cooler (60°F) growing temperatures thereafter.
Days to Emerge: 8–10 days
Seed Depth: ¼"
Seed Spacing: A group of 3 seeds every 24"
Row Spacing: 24"–36"
Thinning: When 2" tall, thin to 1 every 24"
Harvesting: Harvest heads in the morning, if possible, and when buds are tight. Cut stalk below the head. Dunk heads in ice water to reduce any "field heat" and increase storage time. Allow to drain before storing.