It's true. tsf & the pups
Rooting hydrangea cuttings - Locate a stem of softwood and cut a shoot that has several leaves. Trim it into 5-inch-long pieces that each have a leaf toward the top. Remove extra leaves; then cuts the remaining leaf in half to minimize evaporation (and the need for watering). Dip the other end in powdered rooting hormone; plant the cuttings in trays filled with a soilless mix and perlite. Cover with a plastic bag, and stash in a shady location, misting regularly to keep the leaf hydrated.