You are describing internal tip burn. Although the cause is unknown, tip burn has been related to low soil moisture, high fertility, and boron or calcium deficiency. To avoid this problem, maintain adequate fertility, especially during formation of the cabbage head, and avoid excessive fertilization near maturity. Any applications to correct suspected deificiencies should be based on an analysis of the soil. Follow recommendations of the soil analysis.
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What causes the dark or black areas on the leaves inside cabbage heads?
Last Updated: January 08, 2008
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