Large, 4-5 in., rounded panicles cover this mophead-type hydrangea from mid to late summer, beginning in June (much earlier than its contemporaries). The blooms are also long lived and give an extended performance in the garden. Plant displays dense flower clusters of either pink or blue, depending on the acidity of the soil. Mid green, ovate leaves create a fine backdrop for the colorful flower heads and remain fresh throughout the growing season. For best results, plant Nikko Blue in part shade to full sun. Zones 5-9