Aztekium valdezii is a tiny e cactus species just about 2-6 cm tall in habitat, the plants are star-shaped when viewed from above simple or branched from the base.
When blooming, a single nine-petal flower, white in the centre changing to bright magenta on the outside, tops off each plant. Aztekium valdezii is the third species of Aztekium in the family of cacti.