Of Mopheads and Lace-Caps: The Colorful World of Hydrangeas - Those billowy white orbs seen on flowering shrubs this time of the year are not puffs of cotton candy
Landscape: Why Hydranagea macrophylla Don't Flower | Center for Agriculture, Food, and the Environment at UMass Amherst
Tellers Blue Hydrangea - Mophead Hydrangeas | Spring Hill