Hydrangeas are popular garden shrubs with delicate heads of flowers in shades of pink, white, purple or blue.
Hydrangeas thrive in a moist, but well-drained soil, in a cool, semi-shady part of the garden. Try to avoid exposed east-facing sites, where cold winds may damage young spring growth, and also avoid dry, sunny spots.
One of the most interesting things of some hydrangeas is the ability of the flowers to change colour. This colour change is due to the soil pH which affects aluminium availability. Those with blue or pink flowers tend to be blue in acid soil conditions (high available aluminium levels), mauve in acid to neutral soil conditions, and pink in alkaline conditions.
White flowers, and also green-flowered cultivars, remain white or green regardless of soil pH.
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