About Us. Most People’s Loved! Hydrangea Why do my hydrangea flowers change color? The color of some hydrangeas (especially Hydrangea macrophylla) depends on the soil pH.Acidic soil (pH < 6) = Blue flowersNeutral to alkaline soil (pH > 6) = Pink or red flowers More About Us Hydrangea 1_Hydrangea macrophylla2_Hydrangea paniculata Recommended By
