Based on the "Square Foot Gardening" book, plus our experience at the Journey to Forever organic garden.
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One plant in a square (one foot space between plants)
cabbage, broccoli, cauliflower, pepper, eggplant, okra, tomato
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Four plants in a square (six inch space between the plants)
lettuce (crisphead, butterhead, loose leaf), Swiss chard (silver beet), bush beans, kai laan tsoi, baak choi, choi sum, komatsuna, Indian mustard
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Nine plants in a square (four inch space between the plants)
lettuce (cos, mini), beet root, radish, spinach, een choi (leaf amaranth), garlic,
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16 plants in a square (three inch space between the plants)
radish, carrot, spring onion, celery,