The proper size at harvest varies with the crop and growing conditions. Kale is allowed to grow to take two cuttings off one seeding. Some growers continue to strip kale leaves as the plants grow, thereby extending the harvest season for some time.
Greens are usually on a constant field rotation to avoid club-root infestation in the soil.
Field seeding begins in early April and ends in early August. Broadcast and disk all fertilizer prior to planting. Off Buy commercial fungicide-treated seed, if available. If not, dust or pellet seed according to label instructions with Thiram. Alternaria Leaf Spot and Downy Mildew Space rows to allow for good aeration and drying.