. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 784 HYDRANGEA HYDRANGEA again in spring; this will not injure in any way the pro- fusion of fls. In certain kinds of soil the pink Horten- sias show a tendency to turn blue, and perhaps this can be caused by adding iron filings or alum to the soil. n. hortensis is also a valuable plant for forcing, and is much
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 784 HYDRANGEA HYDRANGEA again in spring; this will not injure in any way the pro- fusion of fls. In certain kinds of soil the pink Horten- sias show a tendency to turn blue, and perhaps this can be caused by adding iron filings or alum to the soil. n. hortensis is also a valuable plant for forcing, and is much grown for Easter, especially the var. Otaksa, on account of its dwarfer habit. Handsome pot-plants can be grown in one year from cuttings. In February or March cuttings are inserted in'the propagating house with slight bottom heat,and planted in small pots as soon as they are rooted. During the sum- mer they may be easily grown in pots and plunged outdoors in coal ashes or in any kind of porous soil, transplanted sev- eral times and freely watered and occasionally manured; or they may be planted out in rich soil, exposed to the full ' sun, where water should be liberally given and now and then an application of liquid manure. Last of September they should be repotted in 8- inch pots, kept shady some days until established, and afterwards exposed to the sun. After the first frosts they may be brought into a cool green- house. If intended to have them in flower for Easter, they should be transferred not later than the fore part of January into a warmer house, with a temperature gradually rising from 50° to 60°; the plants should be freely watered, and about once a week an application of liquid manure given until the flower buds are developed. The fls. should be almost fully developed some time before they are desired, that they may be hardened off in a cooler house, since overforced plants are likely to collapse if exposed to sudden changes of temperature. After flowering, the
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