Gathering the Crop.—"This is usually done in spring; commencing as soon as the stalks have attained a serviceable size. No leaves, however, should be plucked the first year, and only a few of the largest and first formed during the second; and this plucking should not be made too early in the season, because, in that case, the plants would be weakened. From the third year, as long as the roots or plantations last, it may be gathered with freedom. A plantation in good soil, and not overmuch deprived of its foliage, will last from ten to fifteen years.
"When the leaves are about half expanded, they may be plucked for use; but, when the largest returns are expected (as in the case of market-gardens), they should be allowed to attain their full size. In removing them, they should be pulled off close to the base, and not cut, to prevent an unnecessary escape of sap, which, in all succulent plants, flows more copiously from a clean cut than from one slightly lacerated or torn. The footstalks should then be separated from the leaves, and tied up in bundles of suitable size for market."—M'Int.
Rhubarb is sometimes blanched. This may be effected without removing the plants, by means of sea-kale pots, or by empty casks open at the top, put over the crowns in March. It can, however, be more perfectly done by taking up the roots, and placing them in some dark place, with a temperature of 55° or 60°; where they should be slightly covered with soil to prevent them from drying. When so treated, they are much more tender, crisp, and delicate than when grown exposed to the sun and air: but the quality is greatly impaired; the pulp, though somewhat acid, being generally comparatively flavorless.
Use.—As before remarked, it is cultivated for its leaf-stalks; which are used early in the season, as a substitute for fruit, in pies, tarts, and similar culinary preparations. When fully grown, the expressed juice forms a tolerably palatable wine, though, with reference to health, of doubtful properties. "As an article of commercial importance in the vegetable markets, it is of very recent date. In 1810, Mr. Joseph Myatts, of Deptford, England, long known for his successful culture of this plant, sent his two sons to the borough-market with five bunches of Rhubarb-stalks, of which they could sell but three." It is now disposed of by the ton, and many acres in the vicinity of nearly all large towns and cities are devoted exclusively to its cultivation.
Varieties.—These are very numerous, as they are readily produced from the seed; but the number really deserving of cultivation is comparatively limited. Old kinds are constantly giving place to new, either on account of superior earliness, size, productiveness, or quality. The following are the prominent sorts cultivated:—
Cahoon.
Leaves remarkably large, often broader than long, and more rounded than those of most varieties; stalk short and thick,—if well grown, measuring from twelve to sixteen inches in length, and three inches or more in diameter; skin thick, uniformly green.
Its remarkable size is its principal recommendation. The texture is coarse, the flavor is harsh and strong, and it is rarely employed for culinary purposes.
In some localities, it is cultivated to a limited extent for the manufacture of wine; the juice being expressed from the stalks, and sugar added in the ratio of three pounds and a half to a gallon. This wine, though quite palatable, has little of the fine aroma of that made from the grape; and, if not actually deleterious, is much less safe and healthful. Any of the other varieties may be used for the same purpose; the principal superiority of the Cahoon consisting in its larger stalks, and consequently its greater product of juice.
Downing's Colossal.