Genus guide

Mammillaria — 46 species

Mammillaria is one of the largest cactus genera, comprising globe-shaped or cylindrical plants densely covered in spines and often ringed by a crown of small, jewel-like flowers in pink, red, or white. Native to Mexico and the southwestern United States, they thrive in full sun and need very infrequent watering — allow the soil to dry completely between drinks and ensure excellent drainage to prevent rot. The genus is non-toxic to cats and dogs, making it one of the safer cactus choices for pet households, though the sharp spines still pose a physical hazard.

All Mammillaria species we cover

Mammillaria — frequently asked questions

Are Mammillaria plants toxic to cats and dogs?

Most Mammillaria are pet-safe. Of the 46 Mammillaria species we cover, 46 are non-toxic on the ASPCA list and 0 carry a toxic or mildly-toxic rating. Even so, confirm the individual species before trusting it around pets.

How much light do Mammillaria plants need?

Most Mammillaria do best in direct sun. If yours stretches toward the window or loses its variegation it wants more light; scorched or bleached leaves mean it is getting too much direct sun.

Are Mammillaria easy to care for?

Some Mammillaria suit more experienced growers — several want strong light, sharp drainage or a specific seasonal rhythm. Check the individual species page for the exact regime.

How many Mammillaria varieties are there?

Growli's care library covers 46 Mammillaria species and varieties — browse them all above. They share a similar light, water and soil pattern, so once you learn one Mammillaria, the rest follow closely.

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