Hydrangea macrophylla sub group Hortenisa (mopheads). Perhaps one of the best known garden plants. Originally from Japan these robust and reliable plants produce a truly stunning display in summer and autumn. Hydrangea macrophylla Renate Steiniger is a compact, deciduous, mophead hydrangea with dense dark green leaves and fabulous large flower heads of one of the richest blues. In alkaline soil the flowers are a pretty baby pink. One of the few Hydrangeas where the quality of both pink and blue flowers is excellent. The colour of the flowers depends on whether your soil is acid (blue) or alkaline (pink). To maintain a blue colour ensure an acid soil and considered using Hydrangea blueing agent. Very easy to grow, it can be grown in the garden or in a pot or container. In containers use a good quality (ericaceous for blue flowers) John Innes compost as this plant will be there a long time and peaty types of compost eventually degrade, become too packed and choke the roots. Ensure you feed regularly as a hungry plant is a poor performer. We recommend Osmoscote pro 8-9 month applied in the early spring. One application gives all the nutrients the plant requires for the whole year. John Innes is a soils based compost. After flowering prune back to close to the old wood. If the plant becomes too large a more drastic pruning can be undertaken!