In the spring or summer, prune 3-4 inch stem cuttings from the parent plant with three to four leaves on the stem.
Dip the ends in root hormone (mixed in water at a paste consistency) and place in damp, well-draining, moist potting soil mix and tamp down around the stem to secure it.
Use a container that has drainage and is deep enough for the roots to grow. Place the stem at least 1-2 inches down into the soil.
Mist inside a clear plastic bag to create moisture and humidity. Place the bag over the top of the plantings and let it set over the planter. There is no need to tie off the bag but allow a little airflow under and into the planting pot.
Set it in bright, indirect sunlight while they are rooting.
Check the moisture and humidity each day and add misting to keep the soil moist while the roots establish.
After 6-8 weeks, roots will begin to form. You can tug onto the stem to ensure the roots are establishing.
Another way is to directly take leaf cuttings from the stem and place the ends in an inch of filtered or bottled water. Replace the water weekly and observe the growth each week. Once you have several healthy roots, combine a little rooting hormone into the well-draining potting mix to help get established. Water the soil and use a clear plastic bag, misting them with water, and place over each leaf to create high humidity. Each week, check the soil moisture and water if needed. After 6-8 weeks, the roots should be firmly in place, and a new baby Croton will continue to grow fresh sprouts!