File:The century book of gardening; a comprehensive work for every lover of the garden (1900) (19966561434).jpg

Title: The century book of gardening; a comprehensive work for every lover of the garden
Identifier: centurybookofgar00cook (find matches)
Year: 1900 (1900s)
Authors: Cook, E. T. (Ernest Thomas), 1867-1915, ed
Subjects: Gardening
Publisher: London, The Offices of "Country life" (etc. )
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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H E KB A CEO US CALCEOL A HI A S. THE GREENHOUSE AND ITS FLOWERS. BY a greenhouse is meant a glass structure for the cultivation of plants that are too tender to stand the winter in the open ground, and at the same time do not require very much heat. A minimum temperature of 4odeg., rising Sdeg. to iodeg. during the day, should he maintained throughout the winter, and as spring advances and the sun gains power, an additional iodeg. may he allowed in the daytime. In erecting a greenhouse, its shape, size, and position w ill of course depend upon the space it is to occupy, hut where possible it should be a span roofed structure, as the light is then admitted on all sides, and consequently the plants grow symmetrical!v. Very often the only position available is close to a wall or dwelling-house, in which case a lean-to green- house is built—that is, one in which the rafters slope direct from the wall at the back" to the front of the structure. A house of this description has one disadvantage, as the plants contained in it grow one-sided, but on the other hand it does not occupy the space needed for a span roofed building. Where a moderately high wall already exists, another form of house, partaking of the characters of both, is often used. This is known as the hip roof or half span, which has full length rafters in front, and at the hack- short ones, extending from the top of the wall to the apex of the roof. All of these lean-to houses should, it possible, face due south or nearly so, but a span routed structure is best running due north and south, as it gets a maximum of light, and the summer's sun at mid-dav does not shine full on the glass. Ventilation is very important, and in a span roofed erection provision should he made for it along the highest part of the roof, while the lights at the sides must be arranged to open or shut at will. Besides this, when the hot-water pipes extend around the outside of the structure a few spaces in the brickwork which can be closed by a small trap are of service, since in cold weather, when the pipes are hot, these traps may be opened, and thus cause a circulation of air without lowering the temperature, as the

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