Hydrangea bushes produce orbs of tightly packed small flowers that blossom in colors that include white, pink and blue. The hydrangea is suitable as an informal edge or as a single specimen plant in the landscape. Adding more hydrangeas to your garden is done by rooting cuttings, saving you the expense of purchasing more plants from the nursery. Propagate hydrangeas from stem cuttings taken from a healthy existing shrub in early summer so they have the best chances of rooting.
Cut off a 5 to 6 inch long piece from the end of a hydrangea branch with a pair of shears. Choose a branch that did not flower, advises the University of Illinois Extension.
Fill a 5-inch diameter flower pot with vermiculite. Water the vermiculite until the excess moisture drains freely from the bottom of the pot.
Strip off the bottom leaves from the hydrangea cutting, leaving just the top grouping of leaves near the tip of the branch in place. Cut the largest leaves remaining down to half their size, making a clean cut that does not leave behind a ragged edge.
Place a rooting hormone, available from garden centers, into a shallow bowl. Dip the end of the cutting in the hormone to coat. Rooting hormone encourages quicker root formation on the cutting.
Insert the cutting into the vermiculite deep enough that it stands upright on its own. Water a second time to ensure even moisture throughout the vermiculite.
Push two wooden skewers into the vermiculite on either side of the cutting. Place a plastic bag over the top of the pot, and rest it on the skewers so the plastic does not touch the hydrangea cutting, creating a small greenhouse.
Place the pot in a brightly lit, warm area that is not in direct sunlight. Water only if the top 1 inch of soil begins to dry. The cuttings root within three weeks.