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Cut a stem at least 4-5 inches long that doesn't have any flowers or buds on it. Trim off the base leaves. Trim half of the top leaf off. A clear, glass container is best, as it allows you to see the roots once they start to form.
Prepare your hydrangea cutting by removing excess leaves from the stem. Set cutting in a vase or glass filled with water. Wait for roots to appear. Change the water in the vase frequently to prevent molding. Plant the cutting once roots appear.