It was discovered that these beautiful seedlings could not survive as they did not have “chlorophyll” and were, therefore incapable of producing the necessary chemical changes that are involved in photosynthesis and which are necessary for the production of the “food” that is necessary for the plant to grow and thrive. It was determined that if these tiny seedlings were “grafted” (an actual physical union of the vascular systems of the two plants) onto fast growing plants such as Hylocereus, that the “base” plant could provide the necessary chlorophyll for the “upper” plant (in this case the Gymnocalyciumseedling lacking in chlorophyll) to thrive. “Moon Cactus” is an excellent subject for window sill culture. Requires porous cactus soil with adequate drainage. Prefers filtered light or shade with ample airflow. Water thoroughly when soil is dry to the touch. Protect from frost.