Mix one part bleach into nine parts water in a bowl. Rinse the cutting knife, pot and any other tools that come in contact with the cutting in this bleach solution to disinfect them.
Select a stem with new growth and healthy leaves for cutting. Remove 6 to 8 inches from the tip of the stem, cutting it off at a 45-degree angle with the sharp, clean knife.
Fill a 5-inch diameter pot with drainage holes with equal parts peat and perlite thoroughly mixed. Water the medium until the excess moisture drains from the bottom drainage holes and the mixture feels evenly moist throughout.
Fill a small bowl with a powdered rooting hormone. Trim off the bottom 1/2 inch of the stem and strip the leaves from the lower third of the stem. Dip the cut end into the hormone, coating it completely.
Insert the cutting into the prepared potting medium far enough so it stands upright on its own. Cover the pot with a clear plastic bag and set it in an area that receives bright but indirect light. Wisteria roots best with bottom heat, so place it on a germination mat set to 70 to 75 degrees Fahrenheit to improve rooting.
Remove the plastic bag when the new growth appears, which indicates the stem has produced new roots. Provide the rooted cutting with bright light and water it when the top 1 inch of soil begins to dry.