Add Yahoo as a preferred source to see more of our stories on Google. Closeup of the bright blue blooms of a mophead hydrangea - Kenwiedemann/Getty Images Hydrangeas are as fascinating as they are ...

I have four huge ‘Limelight’ hydrangea shrubs in my yard. I cut them back every winter and fertilize as needed and every year, they produce beautiful blooms—some are at least the size of my head!

Hydrangea macrophylla (Bigleaf Hydrangea): This variety is most commonly affected by soil pH. It includes both Mophead and Lacecap types. The color change is most dramatic in these hydrangeas.