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Growing Hydrangeas

Hydrangeas are rather easy plants to grow. They prefer loamy, well drained, acidic soil (pH 6.5 to 4.5) enriched liberally with organic matter. Most hydrangeas prefer quite a bit of shade, although H. macrophylla will tolerate much more sun, but will still flourish in mottled sun for part of the day. It is important to keep the roots moist and well fed by covering with mulch; this is especially true with those planted near trees. They may also need protection from spring frosts, which can kill the buds. In some species, the flowers change color according to the amount of aluminum and level of acidity in the soil. H. macrophylla will produce blue flowers in acidic soil where more aluminum is present. The lower the pH, the bluer the flowers. In neutral soil, they take up less aluminum and the flowers are pink. On white flowers, only the eye color of the male flowers will change. To produce blue flowers even if your soil is neutral or alkaline, add aluminum sulfate or sulfur to increase acidity. Plants grown in soil with a pH level higher than 7 (alkaline) can also become chlorotic because of a lack of iron and must be treated accordingly. Pruning should be done in late winter or early spring. This consists of cutting off dead flower heads back to the first leaf node that has buds and dead, weak, or crowded stems back to the base.