Hydrangea Libelle, Lacecap group. Dense multi-stemmed shrub with lush light-green leaves, bold and saucer-shaped. In summer large flattened flower heads with pure white flowers arranged on the outside, surrounding the small blue fertile flowers. Very pretty. These form on two year old wood. Thin out crowded stems in late winter, shorten where necessary. Hardy for cold sites. Best in semi-shade, with good soil moisture.