Autumn Crocus
Autumn crocus (Colchicum autumnale), also called meadow saffron, is a fall-blooming perennial that adds bright pops of color to gardens. Unfortunately, it’s also one of the most dangerous seasonal plants for dogs and cats. Every part of the plant is toxic, and ingestion can cause life-threatening illness. Knowing the risks can help you act quickly if your pet is ever exposed.
This is not to be confused with the spring crocus (Crocus sp.) that blooms in the spring and is non-toxic.
How Autumn Crocus Harms Pets
Toxic compounds: The plant contains colchicine and related alkaloids, which interfere with cell division. These toxins damage tissues and can lead to multi-organ failure.
All plant parts are dangerous: Bulbs, leaves, flowers, and seeds are all poisonous. Even small amounts can cause severe illness.
How it works: Colchicine damages rapidly dividing cells, particularly in the gastrointestinal tract and bone marrow, and can also affect the liver, kidneys, and heart.
Signs of Autumn Crocus Poisoning
Symptoms may occur in stages and sometimes appear mild at first, making it easy to underestimate the danger.
Early (hours after ingestion):
Vomiting (sometimes with blood)
Diarrhea (sometimes with blood)
Abdominal pain
Drooling
Loss of appetite
Progressive (1–2 days after ingestion):
Weakness or lethargy
Dehydration
Low blood pressure or shock
Abnormal blood counts (low red or white cells, clotting problems)
Organ dysfunction (kidney, liver, or heart involvement)
Severe/Late stage:
Bone marrow suppression
Multi-organ failure
Collapse
Death
What to Do if Your Pet is Exposed
If you suspect your pet has eaten any part of this plant:
Call animal poison control immediately for expert guidance
ASPCA Poison Control: (888) 426-4435
Do not wait for symptoms to appear—damage can begin quickly.
Do not induce vomiting unless directed by poison control or your veterinarian.
You may share images of the plant with poison control, for accurate identification
Veterinary Care
There is no antidote for colchicine poisoning, so treatment focuses on aggressive supportive care:
Inducing vomiting (only if safe and very recent)
Activated charcoal to reduce absorption
IV fluids to maintain hydration and support circulation
Medications for nausea, stomach protection, and pain relief
Oxygen therapy or blood transfusions in severe cases
Intensive monitoring of kidney, liver, and bone marrow function over several days
Because the toxin’s effects may be delayed, pets often require hospitalization and repeated lab work.
Prevention
Do not plant autumn crocus where pets have access.
Avoid bringing cut flowers indoors if unsure of species.
Choose safer alternatives for fall landscaping and décor.
Supervise pets outdoors, especially in unfamiliar gardens or parks.
Final Thought
Autumn crocus is beautiful but extremely dangerous for dogs and cats. If you suspect your pet has ingested this plant, call ASPCA Poison Control first and then head to a veterinary hospital right away, if directed.
Adapted from ASPCA Poison Control, with additional veterinary context.
Gal Chivvis, DVM
