Rows should be 3 feet apart. SOIL Collards may be grown on a variety of soils. Heavier loamy soils will produce the greatest yields. The light, well-drained, sandy soils are best for early spring crops. Soils should be well-drained, rich in organic matter and have a pH of 5.8 to 6.5.
Leafy vegetables require quick, continuous growth for best quality.
They need ample nitrogen for good green color and tender growth. A soil test is always the best method for determining the fertilization needs of the crop. Information on soil testing is available in the fact sheet HGIC 1652, Soil Testing . This crop should be sidedressed once during the growing season. Sidedress with ammonium nitrate at 1 pound per hundred feet of row or calcium nitrate at 2 pounds per 100 feet of row.