When to plant Set cabbage plants in late March to early April or in early August for a fall planting. Direct-seeded cabbage can be planted in early July. Cabbage is easily transplanted by choosing stocky, dark green plants with strong root systems. Closer spacing will result in smaller, but more numerous heads. Cultivate carefully to avoid damaging shallow roots.
Irrigation is critical when heads are small and enlarging.
Harvest Cabbage is ready for harvest when the head is fully formed and dense. This can be judged by pressing or squeezing the head to indicate firmness. Waiting too long may result in heads that split, especially after rainfall or irrigation.