Can cats eat the stems of tomatoes? No.

The stems of tomatoes contain alkaloids and atropine, which can affect the digestive, nervous and urinary systems, and even more so in cats and kittens. The bad effects of eating tomato stems The stems of tomatoes contain alkaloids and atropine, which can cause poisoning. The manifestations include: drowsiness, drooling, difficulty in breathing, abdominal pain, vomiting, diarrhea or constipation, muscle weakness, convulsions, dilated pupils, irregular heart rhythm, etc. Note that the owner should usually put the tomatoes out of reach of the cat to avoid accidental ingestion by the cat.