Genus guide
Dioon — 13 species
Part of the Cycads family (Cycadophyta)
Dioon is a genus of ancient cycads native to Mexico and Central America, producing stiff, palm-like fronds from a slow-growing central trunk. They demand bright, direct sun — ideally within a foot of a south-facing window — and very well-draining soil that is allowed to dry out fully between waterings, as they are highly sensitive to overwatering and root rot. All Dioon species are toxic to cats and dogs; every part of the plant, especially the seeds, contains cycasin, a potent toxin that can cause liver failure.
All Dioon species we cover
- Califano's Dioon
- Chestnut Dioon
- Dioon mejiae
- Giant Dioon
- Gum Palm
- Holmgren's Dioon
- Merola's Dioon
- Narrow-leaf Dioon
- Old World Sago Cycad
- Purpus's Dioon
- Rzedowski's Dioon
- Sonoran Dioon
- Tomaselli's Dioon
Dioon — frequently asked questions
Are Dioon plants toxic to cats and dogs?
Most Dioon are not pet-safe. Of the 13 Dioon species in the Growli library, 13 (100%) carry a toxic or mildly-toxic ASPCA classification and 0 are pet-safe. Always confirm the exact species on its pet-safety page before trusting it around cats or dogs.
How much light do Dioon plants need?
Most Dioon 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 Dioon easy to care for?
Some Dioon 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 Dioon varieties are there?
Growli's care library covers 13 Dioon species and varieties — browse them all above. They share a similar light, water and soil pattern, so once you learn one Dioon, the rest follow closely.
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