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Spacing & Depth Plant seeds 1/2 to 3/4 inches deep (8 to 10 seeds per foot of row) Thin seedlings to 4 to 6 inches apart. An alternative method is to thin the seedlings to 2 to 3 inches apart; then, when they are large enough for greens (6 to 8 inches tall), harvest the excess plants whole, leaving a final spacing of 9 to 12 inches between plants.