HYDRANGEA

FLOWERING SHRUB. A shrub found more in the south, where it grows to greater height, and notable for its abundant clusters of pink, red or white blossom, though where iron is present in the soil the flowers may show blue. Pink or red varieties (but not white) can be turned blue by watering the soil with a solution of aluminium sulphate (about 3U oz. of crystals to I gallon of water). Give a warm, rich soil (the same applies to growing in a capacious tub) and plenty of water in very dry weather. The many varieties of Hydrangea macrophylla are the most likely to succeed in the open. They include Heinrich Seidel, deep red, and Queen Emma, pink.

H. petiolaris (scandens) is an excellent climbing species which does well on north walls. It is deciduous and clings by aerial roots like ivy, the large heads or corymbs of white flowers being produced in early summer, and the plant can eventually reach 60 ft. Increase hydrangeas by cuttings of the summer wood, in gentle heat, and give plenty of water till rooted, then plant in a light soil with plenty of sand. Renew soil every year if plants are potted. Protect roots during winter with a covering of loose straw.

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