All Summer Beauty holds its flower color and form through the worst summer heat. It truly lives up to it's name. This hydrangea is not true to any color, and can therefore be easily manipulated by raising or lowering the soil PH. Read more below. Hydrangeas will grow in any good garden soil. They prefer constantly moist area that gets morning sun and afternoon shade. size 4' x 4' Prune for size only, blooms on old wood. Cold hardy to zone 6. COLOR: In these species the exact color often mirrors the pH of the soil; acidic soils produce blue flowers, neutral soils produce very pale cream petals, and alkaline soils results in pink or purple. The typically acidic soils of the Pacific Northwest will cause the variable flowers to bloom toward bright true blues and deep purples. For rose red or deep pink flowers add lime to raise the pH and sweeten the soil. Mulching these plants with plant matter, adding Manure, or a half cup of sulfur will raise the acidity in the Hydrangea grows best in partial to bright shade. Although Hydrangeas are not picky about soil, they are not drought tolerant and will grow and flower more prolifically with regular summer watering.