Fearing Burr, The Field and Garden Vegetables of America
“ As plants of one year's growth produce but few heads, and are also later in their development of these than established plants, it is the practice of many cultivators to set a few young slips, and to destroy an equal part of the old plantation, yearly.Propagation by Seeds.—"Sow the seeds in April, in a nursery-bed; making the drills a foot apart, and covering the seeds an inch deep. When the plants are three inches high, transplant as before directed. Plants from seeds will seldom flower the first year."—M'Int. ”
