Is Larkspur Toxic to Cats?

Yes — Larkspur is severely toxic to cats

Larkspur is closely related to Delphinium and equally dangerous. The diterpene alkaloids cause progressive neuromuscular paralysis. Young plants contain the highest alkaloid concentrations. Even small amounts can be fatal.

Symptoms in Cats

If your cat eats Larkspur, watch for these symptoms (onset: 30 minutes to 2 hours):

Muscle tremors
Stiffness
Weakness
Cardiac failure
Respiratory paralysis
Death

What To Do

Veterinary emergency. Larkspur causes neuromuscular blockade. Young plants and seeds are most toxic. Immediate vet care required.

This is a veterinary emergency for cats. Call your vet or ASPCA Poison Control (888) 426-4435 immediately.

Cat-Safe Alternatives to Larkspur

✓ Snapdragon ✓ Sunflower ✓ Zinnia

Quick Facts

Scientific Name

Consolida ajacis

Also Toxic to Dogs?

Yes (severe)

Toxic Compound

Diterpene alkaloids (methyllycaconitine, deltaline)

Toxic Parts

all parts, seeds, young plants

Sources: ASPCA Animal Poison Control Center, Pet Poison Helpline. View full Larkspur toxicity profile.