Is Larkspur Toxic to Cats?
Also known as: Delphinium, Candle Delphinium, Delphinium elatum · Delphinium elatum
What makes it toxic
Diterpenoid alkaloids, mainly delphinine and methyllycaconitine. They block nerve-to-muscle signaling, producing weakness and paralysis; the youngest growth and the seeds carry the highest concentrations.
Warning signs to watch for
Drooling, vomiting, constipation, tremors, staggering, muscle weakness and seizures. Difficulty breathing and respiratory paralysis can follow; young plants are more toxic than mature ones.
What to do if your cat eats it
This is an emergency. Get the cat to a vet or animal ER immediately, bringing a sample of the plant. Do not wait for signs — by the time paralysis appears, treatment is urgent.
Common questions
How much larkspur can kill a cat?
Even a modest bite of young growth or seed pods carries a dangerous alkaloid dose for a cat’s small body weight. There is no safe amount to nibble.
Is dried larkspur still dangerous?
Yes. Dried larkspur in hay, bouquets or dried-flower arrangements retains its alkaloids and remains highly toxic.
Is delphinium the same thing as larkspur?
They are closely related genera with the same class of toxic alkaloids. Treat Delphinium and Consolida (annual larkspur) as equally dangerous.
More plants checked for cats
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away. Checking what your pet can eat? Visit our sister site SafeOrToxic.