Rooting hydrangea cuttings: Hydrangeas respond well to several propagation techniques, including layering and dividing. But rooting softwood cuttings in summer will yield a bunch of new plants in about four weeks.
Hydrangea starts from cuttings. Put cuttings in water for an hour. Cut the top and the ends of the leaves. Pot cuttting. Put sticks taller than plant and cover with a ziploc bag making sure the bag is not touching the leaves. Place in indirect sunlight and water occasionally. Should root in about 3 weeks. Remove bag and move plant to sunlight for a week.