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Planting cabbage - Fun and easy. Although there are some things you need to do to get things right, planting cabbage isn't particularly difficult, and it can be very rewarding to watch the plant grow from seed or seedlings into large, round, vegetables ready for harvest. Cabbage is a biennial plant, forming the familiar ball head during its first year, and then flowering the second year before going to seed. The flowers are tiny and not particularly spectacular to look at, though a field of cabbage blossoms can be pleasant to the eye. Cabbage, when allowed to grow as a biennial, is grown for its seeds. Most often, however, it is harvested during the first year as a food item.