Greenspire is a perfect. winter hardy variety of hydrangea with conical flowerheads that emerge from July through late fall. As the white petals mature they develop a greenish huge. finally aging to pink for a wonderful array of fall color. Not only is Greenspire winter hardy. it can also thrive in full sun and will give you loads of blooms on the 6 tall bush when it reaches maturity. One of the only hydrangea varieties to be mildly drought-tolerant. it also blooms on new wood so there is no need to worry about those late spring frosts.