Hardy Hibiscus are fairly easy to root. Just cut some 6" to 8" pieces and strip off all but a couple of leaves at the top. If there are any blooms or buds remove those also. Dip the bottom in any rooting hormone, and stick the end in those soil. Water and keep moist, but not wet. It best to place a clear cover over the cutting to hold in the humidity. Place in a bright location, not in direct sun.