"Cultivation, by improving the finer kinds of white Broccolis, is narrowing the distinctive marks: but, although so nearly alike, they must ever remain really distinct, inasmuch as they derive their origin from two very distinct types; viz., the Portugal Cabbage and the Tall Curled Kale. The Cauliflower also originated in the south of Europe, and the Broccoli in the north of Europe, either in Germany or Britain."
Seed.—Broccoli-seeds are rarely raised in this country; most of the supply being received from France or England. In size, form, and color, they are similar to those of the Cabbage or Cauliflower. An ounce may be calculated to produce about five thousand plants, although it contains nearly twice that number of seeds.
Sowing and Cultivation.—In New England, as well as in the Middle and Western States, the seeds of the later sorts should be sown in March or April, in the manner of early cabbages; whilst the earlier varieties may be sown in the open ground, from the middle to the last of May. If the sowing be made in the open ground, prepare a small nursery-bed not too directly exposed to the sun, and sow in shallow drills six or eight inches apart. The last of June, or as soon as the plants have attained sufficient size, transplant them into soil that is well enriched, and has been deeply stirred; setting them at the distance directed for the variety. If possible, the setting should be performed when the weather is somewhat dull, for then the plants become sooner established; but, if planted out in dry weather, they should be immediately and thoroughly watered. If the plants have been started in a hot-bed, they should be set out at the time of transplanting cabbages.
The after-culture consists in hoeing frequently to keep the ground loose and clean, and in earthing up slightly from time to time about the stem.
Some of the early varieties will be fit for use in September; whilst the later sorts, if properly treated, will supply the table till spring.
The difficulties attending the growing of Broccoli in this country arise mainly from the extreme heat and dryness of the summer and the intense cold of the winter. Whatever will tend to counteract these will promote the growth of the plants, and tend to secure the development of large and well-formed heads.
"When the heads of White Broccoli are exposed to light, and especially to the direct influence of the sun, the color is soon changed to a dingy or yellowish hue. It is, therefore, necessary to guard against this as much as possible by frequently examining the plants; and, when any heads are not naturally screened, one or two of the adjoining side-leaves should be bent over the flower-head to shade it from the light, and likewise to protect it from the rain. Some kinds are almost self-protecting; whilst the leaves of others spread, and consequently require more care in shading."—Thomp.
Taking the Crop.—"Broccoli should not be allowed to remain till the compactness of the head is broken, but should always be cut while the 'curd,' as the flowering mass is termed, is entire, or before bristly, leafy points make their appearance through it. In trimming the head, a portion of the stalk is left, and a few of the leaves immediately surrounding the head; the extremities being cut off a little below the top of the latter."—Thomp.
Preservation.—"They are sometimes preserved during winter as follows: Immediately previous to the setting-in of hard frost in autumn, take up the plants on a dry day, with the roots entire, and turn their tops downwards for a few hours, to drain off any water that may be lodged between the leaves. Then make choice of a ridge of dry earth, in a well-sheltered, warm exposure, and plant them down to their heads therein, close to one another; having previously taken off a few of the lower, loose leaves. Immediately erect over them a low, temporary shed, of any kind that will keep them perfectly free from wet, and which can be opened to admit the air in mild, dry weather. In very severe freezing seasons, an extra covering of straw, or other description of dry litter, should be applied over and around the shed; but this should be removed on the recurrence of moderate weather."
They will keep well in a light, dry cellar, if set in earth as far as the lower leaves.