Select a Hydrangea twig for cutting that should be at least 12 centimeters/6 inches long, has no flower and is new growth. Take a sharp pair of shears and cut the stem off just below a leaf node. A leaf node is where a set of leaves is growing.
Strip all but the topmost set of leaves from the cutting. The cutting should have only two leaves left. Dip the end of the cutting in rooting hormone. While rooting hormone which you can purchase at nurseries and garden centers, will increase the chances of successfully propagating hydrangeas, you can still propagate hydrangea shrubs without rooting hormones.
Find a wide, clear plastic bottle or empty peanuts container that is higher than the twig. Fill it with planting soil or peat moss, and add water to moisten the soil. Stick the cutting into the damp potting soil. It should not touch the plastic device, at least not the leaves.
Close the lid and poke a half dozen holes in it, or if you don't have the lid for the device, place plastic over the top opening and also poke holes in the plastic cover.
Place the pot in a sheltered location out of direct sunlight. Check the hydrangea cutting every few days to make sure the soil is still damp. In about two to four weeks, the cutting will be rooted.
This method for propagating works for pretty much of all shrubs, only the times to take the cuttings varies between the types and the locations/hardiness zones. Just google it in typing the plant and the word propagation from cuttings and your planting area.
Have fun with creating new shrubs - almost for free!
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