I have always taken cuttings in the early spring. Cut a new growth branch about 6-12 inches... cut at an angle then dip in rooting hormone... then put it into some good planting soil ( miracle grow is the one I like) about 2-3 inches into the soil (you might want to put a brace up near the cutting for support)... then keep it watered and put it in a semi- shady spot. Do not let it dry out, keep it moist. Then in about a month - six weeks check it for possible new growth. It takes time and patience ... but it can be done.