Is Lupine Toxic to Cats?
Also known as: Lupin, Bluebonnet, Lupinus spp. · Lupinus spp.
What makes it toxic
Quinolizidine alkaloids such as lupinine and sparteine, concentrated in seeds and seed pods. They interfere with nerve signaling and can depress respiration; some species and cultivated varieties carry more than others.
Warning signs to watch for
Drooling, vomiting, diarrhea, lethargy, muscle weakness and stumbling. Larger ingestions can bring tremors, seizures and slowed or labored breathing.
What to do if your cat eats it
Remove plant material and call your vet promptly with details of what was eaten. Weakness, tremors or any breathing difficulty is an immediate emergency.
Common questions
Are the flower spikes as toxic as the pods?
The seed pods and seeds hold the highest alkaloid levels. Flower nibbles usually cause milder stomach upset, but no part is safe to eat.
Is garden lupine different from Texas bluebonnet?
All Lupinus species contain the alkaloids, though concentrations vary by species and variety. Treat every lupine as potentially toxic.
Can dried lupine seeds be more dangerous?
Yes. Alkaloids persist in dried seeds, and a cat playing with fallen pods can crack them open. Clean up fallen seed pods in pet areas.
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.