There is generally very little difference between the two. Some of the fall strains will overwinter better than the spring varieties. The heavier loams will generally produce the greatest yields, but for early spring growth and overwintering in the east, a lighter, well-drained, sandy loam is best. Soils should be well drained, high in organic matter and well prepared. A pH of 6.0 to 6.5 is desirable.
Leafy vegetables require quick, continuous growth for best quality.
They need nitrogen especially for good color and tenderness. If the crop is overwintered, another such sidedressing should be applied in late winter, just prior to new growth. No herbicides are cleared for this crop. Regular and shallow cultivation is essen-tial to keep down weeds and grasses. Irrigation is beneficial, especially for the fall crop, since leafy vegetables require adequate moisture for continuous growth and high quality.