Mixtures of mineral components are well received. A precise mixture of ingredients of the soil for Coryphantha spp. is not very important as long as some general characteristics of the soil are considered. The more northern the origin of the species, the less organic components the soil should contain. It should be friable and not lumpy and not too finely grained. Soil should never stay wet over a long period of time, however, the roots should always be kept a little moist. The optimum soil mixture is around pH 7.
Deep plastic containers are suitable. Clay pots are not suitable as the fine roots growing along the walls of the pot are exposed to the cold of evaporating moisture. Many Cory-phantha spp. have thick roots,taproots or bulbous roots. Therefore, they should be planted in pots of sufficient depth. It is preferable to plant them in a pot which is a little too big than too small. Planting more than one plant per pot should be avoided because Coryphantha spp. are strong competitors and when they are potted together only one of the plants will grow,the others will die sooner or later. To obtain good drainage some bigger stones should be put into the pot first. In addition, the soil should be covered with some bigger stones as well to allow the base of the plants to dry more easily (important mainly for species with a thin root "neck" like C. wohlschlageri, C. glan-duligera, C. pulleineana etc.).
Replanting is possible during the entire period of vegetation. However, the best time is early spring before the start of vegetation. Since the plants grow slowly, it is enough to replant them every few years.
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