The plant has been overly collected in its habitat and the wild population is threatened. Get your star cactus plants from an accredited nursery that grows them from seed. This cactus is hardy in USDA plant hardiness zones 8 to 9 but does perfectly well in a sunny window in the home. If you get your hands on seeds, start them in seed flats with a sandy composite soil mix. Keep the soil moist until germination and then move them to a sunny location with protection from noonday sun. Mist the soil when caring for star cactus babies as overhead watering can damage the tender tissues. They will need to be kept moist until the seedling is robust and at least ½ inch tall.
Astrophytum Cactus Care Novice gardeners love the ease of cacti care as interior plants. They thrive on neglect, although star cactus plants will need water occasionally. The body will flatten out and turn brown if it is in dire need of water. Pot them up in a purchased cactus mix or equal parts potting soil and sand. The container should be free draining and unglazed so excess moisture evaporates readily. April is the best time to re-pot, but actually the plants like to be pot bound so this doesn’t need to be done frequently. Fertilize June to September when caring for star cactus. Reduce the amount of water you give in the dormant winter months. Root rots, scab and mealybugs prey on this plant. Watch for signs and treat immediately