Hydrangea macrophylla 'Renate Steiniger' is a deciduous shrub known for its bold, mophead blooms and robust growth habit. It typically reaches a height and spread of 1.2–1.5 metres, forming a rounded, bushy shape with large, serrated green leaves. From early to late summer, it produces large, dome-shaped flower heads in shades of vivid blue in acidic soils or pink in more alkaline conditions. It is commonly used in garden borders, foundation plantings, and mixed shrub beds, valued for its vibrant colour, reliable blooming, and suitability for cut or dried flower arrangements.