Hydrangea macrophylla 'snowball' Hydrangeas are one of my favorites. I have here and had them in my backyard in Atlanta. One time when Rob was released from the hospital my friends filled my houses with vases of hydrangeas.
HYDRANGEA COLOR - Color is determined indirectly by the soil pH, which affects the availability of aluminum in the soil. In acid soils the flowers will be blue, in alkaline soils the flowers will be pink.