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Encyclopedia Britannica



HYDRANGEA

This article appears in Volume V14, Page 34 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: HOR-I25
HYDRANGEA , a popular flower, the plant to which the name is most commonly applied being Hydrangea Hortensia, a low deciduous shrub, producing rather large
oval
  strongly-veined leaves in opposite pairs along the
stem
 . It is terminated by a massive globular corymbose head of
flowers
 , which remain a long period in an ornamental
condition
 . The normal colour of the
flowers
 , the
majority
  of which have neither stamens nor pistil, is
pink
 ; but by the influence of sundry agents in the soil, such as alum or iron, they become changed to blue. There are numerous varieties, one of the most noteworthy being "
Thomas
  Hogg " with pure white flowers. The part of the inflorescence which appears to be the flower is an exaggerated expansion of the sepals, the other parts being generally abortive. The perfect flowers are small, rarely produced in the species above referred to, but well illustrated by others, in which they occupy the inner parts of the corymb, the larger showy neuter flowers being produced at the circumference.
There are upwards of thirty species, found chiefly in Japan, in the mountains of India, and in North America, and many of them are familiar in gardens. H. Hortensia (a species long known in cultivation in China and japan) is the most useful for decoration, as the head of flowers lasts long in a fresh state, and by the aid of forcing can be had for a considerable periodfor the ornamentation of the greenhouse and conservatory. Their natural flowering season is towards the end of the summer, but they may be had earlier by means of forcing. H. japonica is another fine conservatory plant, with foliage and habit much resembling the last named, but this has flat corymbs of flowers, the central ones small and perfect, and the outer ones only enlarged and neuter. This also produces
pink
  or blue flowers under the influence of different soils.
The Japanese species of hydrangea are sufficiently
hardy
  to grow in any tolerably favourable situation, but except in the most sheltered localities they seldom blossom to any degree of perfection in the open air, the head of blossom depending on the uninjured development of a well-ripened terminal bud, and this growth being frequently affected by
late
 
spring
  frosts. They are much more useful for pot-culture indoors, and should be reared from cuttings of shoots having the terminal bud plump and prominent, put in during summer, these developing a single head of flowers the succeeding summer. Somewhat larger plants may be had by nipping out the terminal bud and inducing three or four shoots to start in its place, and these, being steadily developed and well ripened, should each yield its inflorescence in the following summer, that is, when two years old. Large plants grown in tubs and vases are fine subjects for large conservatories, and useful for decorating terrace walks and similar places during summer, being- housed in winter, and started under glass in
spring
 .
Hydrangea paniculata var. grandiflora is a very handsome plant; the branched inflorescence under favourable circumstances is a yard or more in length, and consists of large spreading masses of crowded white neuter flowers which completely conceal the few inconspicuous fertile ones. The plant attains a height of 8 to ro ft. and when in flower
late
  in summer and in autumn is a very attractive object in the shrubbery.
The Indian and American species, especially the latter, are quite
hardy
 , and some of them are extremely effective.


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