A Christmas cactus cutting can be grown by taking a piece of the cactus and placing it in a pot filled with well-draining soil. The cutting should be placed in a bright but indirect light and watered regularly, allowing the soil to dry out between waterings. With proper care, the cutting should begin to grow roots and leaves within a few weeks. After the cutting has grown new roots, it can be transplanted into a larger pot and given more space to grow. With proper care, the Christmas cactus cutting should flourish and produce beautiful flowers.