Buckwheat — Food safety facts
Safe to share · Cats · full breakdown on the linked food page
Cooked plain buckwheat is safe in small amounts.
The full verdict, portion guidance and serving notes are collected on the Buckwheat food facts page.
Short answer
Buckwheat is safe for cats when cooked plain. No poisoning symptoms are expected, but overeating may cause mild stomach upset within 6-12 hours. Offer fresh water and skip the next meal if your cat ate a large portion. Call your vet if you see vomiting lasting more than a day.