Take a healthy semi-hardwood cutting from a mature bougainvillea plant
Use a sharp, clean cutting tool
Cut a stem section about 4 to 6 inches long
Remove the lower leaves
Keep 2 to 4 leaves at the top
Dip the cut end in rooting hormone
Fill a pot with well-draining propagation mix
Make a hole in the soil with a pencil or stick
Insert the cutting into the hole
Firm the soil around the cutting
Water lightly
Place the pot in bright indirect light
Keep the soil slightly moist, not wet
Cover the cutting with a plastic bag or humidity dome if needed
Ventilate occasionally to prevent mold
Wait for roots to develop
Transplant once the cutting is well rooted
Harden off the new plant before moving it outdoors