Genus guide
Astrophytum — 9 species
Part of the Cacti family (Cactaceae)
Astrophytum is a small genus of slow-growing globular cacti native to Mexico and Texas — including Star Cactus, Bishop's Cap, and specialty cultivars such as Onzuka Bishop's Cap and Astrophytum coahuilense — prized for their ribbed, often white-flecked bodies and cheerful yellow blooms. They demand bright direct or intense indirect light and extremely well-draining soil; use the soak-and-dry method, allowing the growing medium to dry out fully between waterings to prevent root rot. According to ASPCA, Astrophytum species are non-toxic to cats and dogs, making them one of the safer cactus choices for pet households.
All Astrophytum species we cover
- Astrophytum coahuilense
- Bishop's Cap Cactus
- Goat's Horn Cactus
- Goat's Horn Cactus
- Monk's Hood Cactus
- Monk's Hood Cactus
- Onzuka Bishop's Cap
- Star Cactus
- Super Kabuto Star Cactus
Astrophytum — frequently asked questions
Are Astrophytum plants toxic to cats and dogs?
Most Astrophytum are pet-safe. Of the 9 Astrophytum species we cover, 9 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 Astrophytum plants need?
Most Astrophytum 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 Astrophytum easy to care for?
Some Astrophytum 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 Astrophytum varieties are there?
Growli's care library covers 9 Astrophytum species and varieties — browse them all above. They share a similar light, water and soil pattern, so once you learn one Astrophytum, the rest follow closely.
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