are grown as ornamentals. This cactus has a clumping habit and grows from 3 to 6 inches tall and 4 to 5 inches wide
Thimble Cactus
Mammillaria gracilis is a small cactus with somewhat slender, cylindrical, bright green body clustering and branching freely, but the offsets easily detached.
Thimble Cactus Easy to grow house plant. Like the other Cactus it requires bright indirect Sun Light, but only needs to be watered when dry.