Coryphantha elephantidens houseplant watering should be reduced to

watering should be reduced to once every 3 to 4 weeks

Watering should only be done directly on the soil

and make sure the soil drains well

The product that you see in the picture is the same that you will get

and in the eyes the sap can cause temporary blindness which may last for several days

Coryphantha elephantidens houseplant watering should be reduced toCoryphantha elephantidens endemic to Mexico where it is known to occur in the states of Aguascalientes, Guerrero, Guanajuato, Hidalgo, Jalisco, Mxico, Michoacn, Morelos, Oaxaca, Puebla, Quertaro, Veracruz and Zacatecas. The name elephantidens is Latin and means 'elephant tooth'. It is a large, depressed globular cactus, simple or occasionally clumping and group forming. C. elephantidens usually has pink flowers but they can sometimes be yellow.