Intense sky45blue flowers adorn this compact deciduous shrub over a long period throughout summer and early autumn hydrangea macrophylla 39nikko blue39 has a tidy rounded habit and becomes smothered in blue flowers for unbeatable performance in borders and patio containers like all mophead hydrangeas the flowers change colour depending on your soil ph taking on pink hues in more alkaline soils happy in sun or dappled shade hydrangea 39nikko blue39 is perfect for woodland ga