Hydrangea macrophylla 'Blue Wave'
Genus: Hydrangea
Species: macrophylla
Variety: 'Blue Wave'
Plant Type: Deciduous, Shrub
Also known as H. 'Mariesii perfecta'. It bears lots of broad flat heads of blue 'lacecap' flowers from july to the autumn when grown on acid soil, otherwise they will be purple-pink. It's a nice, compact variety,