Here in the South, you can just take one of the lower limbs and bend it down to the soil around it, scrape just slightly on the portion of a limb close to a leaf node, then lay the limb down and weight it down with a brick. It would help to use a rooting hormone. I'm posting a link to the South's "guru" of all things hydrangea (and others) and he probably has instructions on his site as well. Good luck with it.
Hi, bugme is right. I do that, also. It's called layering.
Hydrangeas will also root if you have a small branch you don't mind cutting off: Trim all leaves off except 2 - 4 at the top. Wound the bottom a little and dip in rooting hormone. Place in sandy soil and water regularly, keeping moist.
I actually did this yesterday, trimming little branches from the back side of my bushes. I will layer the lowest ones.
I have three types of Hydrangeas, including the evergreen one which shows for the berries, instead of the blooms. I thought that was interesting, so I HAD to have it!
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