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1.Plant seeds ¼-½ inch deep, 2-3 weeks before the last frost. Thin seedlings or transplant cauliflower 12-18 inches apart in the row with rows 2-3 feet apart.2. For best growth, side-dress the plants with a high-nitrogen fertilizer 3 to 4 weeks after transplanting.3.Like most vegetables, cauliflower needs at least 6 hours of full sun each day; more is better. It also needs fertile, well-drained, moist soil with plenty of rich organic matter.4.Improve your soil by adding well-rotted manure or compost in spring or fall