Pet safety
Is Holmgren's Dioontoxic to cats & dogs?
Dioon holmgrenii
Quick verdict — at a glance
- Toxic to cats?
- Yes — toxic
- Toxic to dogs?
- Yes — toxic
- ASPCA classification
- Toxic to pets · botanical name Dioon holmgrenii
Is holmgren's dioon safe for cats and dogs?
Toxic — the ASPCA lists holmgren's dioon as a clear no for cats and dogs. The painful part for the pet is usually quick and intense; the right move is to keep it out of any room a pet roams unsupervised. This classification follows the ASPCA Toxic and Non-Toxic Plant List, the most widely used reference for companion-animal plant safety in the US and the standard most UK vets cite as well. Contains cycasin (a hepatotoxic glucoside) and BMAA neurotoxin throughout all plant tissues, including seeds, leaves, and roots. Ingestion by dogs, cats, or humans causes vomiting, diarrhoea, acute hepatic failure, and potentially fatal neurological damage. Seeds are most dangerous. Zamiaceae cycads are classified as severely toxic by ASPCA.
| Pet | Toxic? | Per ASPCA |
|---|---|---|
| Cats | Yes | Toxic to pets |
| Dogs | Yes | Toxic to pets |
What happens if a pet eats holmgren's dioon?
Contains cycasin (a hepatotoxic glucoside) and BMAA neurotoxin throughout all plant tissues, including seeds, leaves, and roots. Ingestion by dogs, cats, or humans causes vomiting, diarrhoea, acute hepatic failure, and potentially fatal neurological damage. Seeds are most dangerous. Zamiaceae cycads are classified as severely toxic by ASPCA. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to holmgren's dioon, treat it as a suspected ingestion and act on the steps below.
What to do if your pet ate holmgren's dioon
- Remove any plant material from your pet's mouth and move holmgren's dioon out of reach.
- Note how much was eaten and when, and watch for drooling, vomiting, or lethargy.
- Do not induce vomiting unless a vet or poison-control specialist instructs you to.
- Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice.
- Bring a leaf or photo of holmgren's dioon to the appointment so it can be treated correctly.
This page is general guidance, not veterinary advice. Pets vary, and a reaction may be to soil, fertiliser, or pesticide rather than the plant. If you are worried, always contact a vet or the ASPCA Animal Poison Control Center on (888) 426-4435 — do not wait for symptoms to worsen.
Pet-safe alternatives to holmgren's dioon
Want the same look without the risk? These plants are listed as non-toxic to cats and dogs by the ASPCA and have similar care needs:
- Prayer plant — non-toxic to cats and dogs (care guide)
- Calathea — non-toxic to cats and dogs (care guide)
- Parlor palm — non-toxic to cats and dogs (care guide)
- Areca palm — non-toxic to cats and dogs (care guide)
Holmgren's Dioon and pets — frequently asked questions
Is holmgren's dioon toxic to cats?
Holmgren's Dioon (Dioon holmgrenii) is toxic to cats according to the ASPCA. Contains cycasin (a hepatotoxic glucoside) and BMAA neurotoxin throughout all plant tissues, including seeds, leaves, and roots. Ingestion by dogs, cats, or humans causes vomiting, diarrhoea, acute hepatic failure, and potentially fatal neurological damage. Seeds are most dangerous. Zamiaceae cycads are classified as severely toxic by ASPCA. Keep it out of reach and contact your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 if your cat chews it.
Is holmgren's dioon toxic to dogs?
Per the ASPCA, Holmgren's Dioon (Dioon holmgrenii) is toxic to dogs. Dogs often chew more enthusiastically than cats, so a toxic plant like holmgren's dioon is best removed from the floor and low shelves entirely.
What happens if my pet eats holmgren's dioon?
Contains cycasin (a hepatotoxic glucoside) and BMAA neurotoxin throughout all plant tissues, including seeds, leaves, and roots. Ingestion by dogs, cats, or humans causes vomiting, diarrhoea, acute hepatic failure, and potentially fatal neurological damage. Seeds are most dangerous. Zamiaceae cycads are classified as severely toxic by ASPCA. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to holmgren's dioon, treat it as a suspected ingestion and act on the steps below.
What should I do if my cat or dog ate holmgren's dioon?
Stay calm. Remove any remaining plant material from your pet's mouth and take the plant away so they cannot eat more. Note roughly how much was eaten and when. Do not make your pet vomit unless a vet or poison-control specialist tells you to. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 (a consultation fee may apply) and follow their advice. Bringing a photo or a leaf of holmgren's dioon to the appointment helps the vet treat it correctly.
What are pet-safe alternatives to holmgren's dioon?
If you want a similar look without the risk, good non-toxic swaps include prayer plant, calathea, parlor palm, areca palm. All of these are listed as non-toxic to cats and dogs by the ASPCA, so they suit a home where pets have access to your plants.
Full holmgren's dioon care
Pet-safety is one piece of the picture. For light, watering, soil, and troubleshooting, see the complete holmgren's dioon care guide, or browse the full pet-safe plant library to check another plant before you buy it.