Maintaining adequate moisture and nitrogen is essential for this continuous, rapid growth. Roots of cole crops are shallow, so irrigation should be more frequent but lighter than for deeper rooted crops. Water immediately after transplants are set and whenever the soil surface begins to look dry. Several irrigations may be needed when rain is infrequent. Avoid over-irrigating, as poor drainage as well as lack of water is harmful.
Nitrogen can be side-dressed when cultivating or hoeing or applied and irrigationd into the soil.
Insects Aphids, the larvae of diamondback moths, cabbage loopers, and other worms are common cabbage pests. To control these, start a good spray program before the insects build up to any extent. Good spray coverage of both sides of the leaves is necessary since many insects are found on the underside of leaves and in leaf crevices. It is best to apply products containing B. t. late in the evening, as ultraviolet rays will destroy this material. Applications will need to be made every five to eight days.