File:The Gardeners' chronicle - a weekly illustrated journal of horticulture and allied subjects (1880) (14781579401).jpg

Identifier: gardenerschronic13lond (find matches)
Title: The Gardeners' chronicle : a weekly illustrated journal of horticulture and allied subjects
Year: 1874 (1870s)
Authors:
Subjects: Ornamental horticulture Horticulture Plants, Ornamental Gardening
Publisher: London : (Gardeners Chronicle)
Contributing Library: UMass Amherst Libraries
Digitizing Sponsor: Boston Library Consortium Member Libraries

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n often rendersit desirable to allow a considerable spacebetween the glass and the leaves orstems. This allows the air to move freely,for it is found in practice that a free mo-tion of the air is one of the best and mostpotent preventatives of leaf-scorching or scald-ing. Again, heat is in the wrong place when itis permitted to concentrate its energy on the the outside of the balls, and in closest proximityto the hottest portion of the pots. Of course good cultivators adopt means toprevent the heat of the sun from crippling orkilling their plants. Double potting, the ren-dering opaque the lowermost squares in green-houses and conservatories, tend to keep theroots cool; but lady gardeners and ama-teurs, as a rule, seldom take such pre-cautions, and the consequence is an enormousannual death-rate from the suns heat inthe wrong place. Some plants, too, aremuch more susceptible to injury from thiscause than others. Camellias, for e.\ample, sufferperhaps more than any other plants from the
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Sr:LJat Fig. 123.—carlina acaulis, nat, size, (see p. 722,) Undoubtedly. How then can it kill plants ?Easily ; for the sun is not merely the source oflight, but the centre of heat. The latter is asessential as light to the health and strengthof plants, yet, nevertheless, heat in the wrongplace, at the wrong time, or in excess, speedilykills plants ; and in practical horticulture plantsare often exposed to one or more, and sometimesto all, of these evils, either in succession ortogether. For example, the leaves or stems of Vines orother plants crowded up against the glass receivethe heat and light of the sun in the wrong place,and are scorched or semi-scalded in conse-quence. The theory that the nearer the glassthe more intense the light, and consequently surface or sides of the pots. In some casesthe leaves shield the roots from thescorching heat of the sun ; this purpose isfrustrated entirely when, under artificial con-ditions, the sides or surface of the pots areallowed to become

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