Mustard matures in 35 to 45 days and grows in ordinary garden soil if not too acid. Plant seed 1/2 inch deep, from late April to mid-May. Space the rows 18 to 24 inches apart with the plants 6 to 8 inches apart after thinning. The plants go to seed in hot weather. Such plants are pulled out and the space given to another crop. Harvest mustard before it is fully grown. The crop is not stored.
Edema causes small, brownish-gray, wart like growths on the leaves. The condition develops during cool nights following warm muggy days. The problem is caused by plants taking up more water than is lost. The outer layer of cells is broken and underlying tissue becomes corky.
Premature seed formation is caused by exposure of transplants to temperatures below 45 degrees.