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Square Foot Gardening Plant Spacing. To calculate how many plants per square, look on the back of the seed packet. Totally ignore the row spacing. Just look at the plant spacing: 12″ apart, plant 1 per square. 6″ apart, plant 4 per square. 4″ apart, plant 9 per square. 3″ apart (or less), plant 16 per square. (plants listed on website)