the white leaves are present on all our big leaf hydrangeas. however, this is the only one displaying the pale green/yellowish leaves also. the rest of the plants are deep green, lush leaves... other than that the plant seems to be fine. flowers are starting to turn blue and open up, stems are strong and upright. im thinking its a soil condition. but im no expert! ha! either something foreign in the soil, or the soil is missing something. several of our clematis plants kinda have the same symptoms, but not nearly as severe.
