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To grow, broccoli plant needs a minimum of 6-8 hours of direct sunlight every day. There is a sufficient supply of sunlight, which encourages good leaf growth and heavy heads. Plant spacing of 18 to 24 inches to ensure adequate circulation of air to avoid congestion. Dense plants are in competition with nutrients and light and this may lead to smaller heads. Adequate spacing also ensures the prevention of diseases, and it is also more convenient to maintain and harvest plants.