Growing barrel cactus requires a sunny location, well-drained potting soil and minimal watering.
Soil for barrel cactus is mostly sand with a little topsoil, perlite and compost. Prepared cactus mixes are suitable for growing barrel cactus. Unglazed pots are best for potted cactus because they allow the evaporation of excess water.
Water is a very important component to caring for barrel cactus. The plants are native to arid desert regions and usually have only rainfall to supply their moisture needs. Water your barrel cactus once per week in summer. The barrel cactus doesn’t need much water in winter when it is dormant. Water once between December and February. Adequate water in spring may cause the plant to produce a large yellow flower. Rarely the plant will then grow an edible fruit.