Air layering is the best way to propagate Hibiscus. Select a point on the branch you wish to use and cut a notch 1/3 of the way through the branch. If you have rooting hormone, rub it into the notch (if you don't have rooting hormone don't worry about it as it isn't really necessary). Wrap a handful of damp sphagnum moss (NOT peat moss or Spanish moss) in a ball completely covering and surrounding the wound. The roots will grow into this moist sphagnum moss. Wrap clear plastic wrap completely around the moss, sealing it tightly with tape or rubber bands so the moss cannot dry out. Wait patiently for a month or longer for roots to develop. If there are no visible roots after a month or so, carefully remove the plastic to inspect for new roots and to make sure the moss hasn't dried out. If necessary, re-dampen and rewrap the moss around the branch as before. When there is a healthy batch of roots
growing into the moss, completely sever the branch just below the roots and pot into a small pot. It can take another couple months for a strong, healthy root system to form during which time be cautious not to overwater. Don't worry if you lose a few leaves during the process.
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