Argentina (Tucum n).
Mammillaria schiedeana is an attractive, slow growing cactus, up to 4 inches (10 cm), with short, hairy spines. The stem is globular flattened, more or less rounded at the top, dark green, soft-fleshed, up to 2.4 inches (6 cm) in diameter. It has up to 120 thin radial spines per areole, white to pale cream with yellowish bases, up to 1 inch (2.5 cm) long. The flowers are white to cream, up 0.6 inch (1.5 cm) long and appear in winter..
Mammillaria species like most cacti they're drought tolerant and need very little care and attention to grow well . Plenty of sunshine will keep this cacti more than happy. Provide bright, even light to encourage tight growth and flowering. Some shade during a hot summers day can be helpful to prevent sunburn.
Allow the soil mix to become nearly dry between watering, but then water thoroughly. Suspend watering in the winter, but mist occasionally. Not enough sunlight and over-watering are common mistakes.
Use pot with good drainage and a very porous potting media.
Feed every 4 weeks with a high potassium fertiliser during summer
It is an excellent plant for garden rockery settings, desert type landscapes, patios and botanical gardens
For watering cacti, the golden rule is to make sure the soil is completely dry before watering! This will stop the roots from rotting. It is advised to always use a pot with a drainage hole so that excess water can get drained out. If kept in a sunny area, you will need to water it once every week. If it is in a semi shaded or filtered light area, you might need to water it once in 2 weeks.
Cacti like soil that is well aerated and fast draining. You can fertilise the cactus in the summer months when it is in its growing season. During the winters it is best to cut back on any fertiliser and let the plant rest.