How to Care for a Ball Cactus Plant
Light: Ball cactus plants do not like direct mid-day sunlight, and should be placed in partial shade through the hottest hours of the day. Direct sunlight in the morning and afternoons is okay.
Water: During the spring and summer your cactus will grow the fastest. Provide your cactus with regular watering to keep the potting soil lightly moist, but not soaked. In the winter do not water as frequently, and let the soil dry slightly between waterings, but do not let it completely dry out.
Soil: Cacti need quick draining soil, so any cactus soil will do great
Humidity: The average humidity in a house is perfect for a ball cactus