Most gardeners that grow hydrangea, a perennial flowering shrub, value the plant most for its ability to take a shady corner of the garden and bring it to life. With its huge, pom-pom-like flowers and dark green foliage, the hydrangea makes a striking accent in the woodland-themed garden. Rooting hydrangea cuttings is easy; you should take the cuttings anytime between April and August.
Fill the planting pot with sand to within 1/4 inch of the top. Water it well, and allow the water to drain from the bottom. Water again, and allow it to drain. Use your finger or a pencil to create a hole in which you will stick your cutting.
Cut a 6-inch long branch from the hydrangea. The cutting should be from old growth (one that did not flower in the current year) and taken just below a leaf node.
Remove all the leaves from the cutting except for two or three at the top. Using a razor blade or very sharp scissors, cut large leaves to half their size.
Dip at least 1 inch of the cut end of the branch into the rooting hormone, and tap it on the side of the container to remove any excess hormone. Stick the cutting into the prepared hole, burying at least two leaf nodes (bumps on the branch where the leaves that you removed once joined it) in the sand and pack the sand around it.
Place small sticks around the perimeter of the planting pot and cover the pot with a plastic bag. Adjust the sticks so that they hold the plastic away from the cutting.
Place the bagged cutting in an area that receives lots of light, but not direct sun--under a tree that provides dappled sunlight is ideal.
Check the soil periodically. When the top inch is dry, water it. Your hydrangea cutting should form roots within three weeks. Some varieties may take longer. You will know that the cutting has rooted when it sprouts new growth.