Grapery. The European grapes rarely thrive out of doors in eastern America. Grape houses are necessary, with or without artificial heat. Fruit for home use may be grown very satisfactorily in a cold Grapery (without artificial heat). A simple lean-to against the south side of a building or wall is cheap and serviceable. When a separate building is desired, an even-span house running north and south is preferable. There is no advantage in having a curved roof, except as a matter of looks. A compost of four parts rotted turf to one of manure is laid on a sloping cement bottom outside the house, making a border 12 feet wide and 2 feet deep. The cement may be replaced with rubble on well drained soils, but it is a poor makeshift. Every three years the upper 6 inches of the border should be renewed with manure. The border inside the house is prepared likewise. Two-year-old potted vines are planted about 4 feet apart in a single row. Part of the roots go through a crevice in the wall to the outer border and part remain inside; or all may go outside if the house is desired for other purposes. One strong cane is trained to a wire trellis hanging at least 18 inches from the glass, and is cut back to 3 feet the first year, 6 the second, and 9 the third. Do not be in a hurry to get a long cane. Pruning is on the spur system, as recommended for arbors on [page 120]. The vines are usually laid on the ground for winter and covered with leaves or wrapped with cloth.
As soon as the buds swell in early spring, tie the vines to the trellis and start out one shoot from each spur, rubbing off all others. After the berries begin to color, however, it is better to leave all further growth to shade the fruit. Pinch back each of these laterals two joints beyond the second bunch. To keep down red spider and thrips, the foliage should be sprayed with water every bright morning except during the blooming season. At least one-third of the berries should be thinned from each bunch; do not be afraid of taking out too many. Water the inside border frequently all through the summer, and the outside occasionally if the season is dry. Mildew may appear in July. The best preventives are to syringe faithfully, admit air freely, and sprinkle sulfur on the ground.
Fruit may be kept fresh on the vines in a warm (or artificially heated) Grapery until late December: in a coldhouse it must be picked before frost. After the fruit is off, ventilate from top and bottom and withhold water, so as to thoroughly ripen the wood. Along in November the canes are pruned, covered with straw or wrapped with mats and laid down till spring. Black Hamburg is superior to all other varieties for a cold Grapery; Bowood Muscat, Muscat of Alexandria and Chasselas Musque may be added in the warmhouse. Good vines will live and bear almost indefinitely.—S. W. Fletcher.
Grasses of various kinds are grown for ornament, the most popular types being the hardy perennials, which make attractive clumps in the lawn or border. The best of the permanent kinds in the North are the various sorts of Eulalia (properly Miscanthus). When once established they remain for years, making large and bold clumps. The striped kind, or zebra grass, is particularly good. These grasses thrive in any good soil. They grow from 4 to 7 feet high. The great reed, or Arundo Donax, is a bold subject and perfectly hardy. In a rich and rather moist soil, it grows 10 to 12 feet high when well established. Pampas Grass is most excellent in the Middle States and South. Some of the big native grasses and sedges make attractive lawn clumps.
Grasses are also grown for dry or everlasting bouquets. For this purpose, small-growing delicate annual species are mostly used. Good types are species of agrostis, briza, bromus, eragrostis, and pennisetum. Seeds of these and of others are sold by seedsmen. With ordinary treatment, they thrive in any garden soil.
For notes on sod-making, [see Lawn].
Greenhouse. In America the word Greenhouse has come to be applied to all kinds of glass-houses in which plants are grown. Originally the word was applied to those houses in which plants are merely preserved or kept green during the winter. Other types of glass-houses are the conservatory, in which plants are displayed; stove or hothouse, in which plants are grown in a high temperature; the propagating pit, in which the multiplication of plants is carried forward; and the houses which have various temperatures, as cold, cool and intermediate. The principles which underlie the construction and management of glass-houses are too extensive to be discussed here. The reader should refer to special books on the topic. For the general subject, Taft’s “Greenhouse Construction” and “Greenhouse Management” are excellent. For particular applications to floriculture, Hunt’s “How to Grow Cut-flowers” is a standard work. For applications to the forcing of vegetable crops, Bailey’s “Forcing-Book” may perhaps be consulted.
The smaller the glass-house the more difficult it is to manage, because it is likely to be more variable in temperature, moisture and other conditions. This is particularly true if the house is a small lean-to against the south side of a dwelling house, for it becomes very hot at midday and comparatively cold at night. In order to moderate the heat in these little houses, it is ordinarily advisable to use ground glass for the roof or to whitewash it. The house conservatory may be heated by a coal stove, but the best results are rarely to be attained in this case. A stove is likely to leak gas, and the temperature is more or less uneven. The best results are to be attained when the conservatory is heated by steam or hot water, piped in the modern fashion with wrought iron pipes, which go together with threads. If the conservatory is heated from the heater which supplies the dwelling house, it should have an extra amount of pipe; otherwise it will be necessary to keep the dwelling house too hot for comfort in order to maintain the conservatory at its proper temperature. It is always best, when practicable, to heat the conservatory with a separate apparatus. There are various small hot water and steam heaters, the size of coal stoves, which are excellent for the purpose. For a small conservatory, hot water is usually preferable to steam, since it is less likely to fluctuate. For large establishments, however, the steam is usually the better. For further discussions of related subjects, see [Hotbed], [Window Garden], [Potting] and [Watering].
Grevillea. A very graceful greenhouse plant, suitable for house culture. The plants grow freely from seed, and until they become too large are as decorative as ferns. Grevilleas are really trees, and are valuable in greenhouses and rooms only in their young state. They withstand much abuse. They are now very popular as jardiniere subjects. Seeds sown in spring will give handsome plants by the next winter.
Gypsophila. Baby’s Breath. Gypsophila muralis is one of the dainty little plants called Baby’s Breath. It is a low-growing annual forming compact mounds of green, thickly covered with little pink flowers. It is one of the most attractive border plants in cultivation. It is also a charming pot-plant. G. paniculata is a hardy perennial having panicles of bluish white flowers. This is very graceful, and the flowers are fine for cutting and for use with sweet pea bouquets or with other choice flowers. The panicles are so lasting that they may be used in winter bouquets. The annuals may be planted 1 foot apart; the perennials 3 feet. Both are readily grown from seed, and bloom the first year.