I had a hard time finding any research on this, the best I could come up with was a question about dogs and pomegranates on the aspca site. The answer was that any part of the pomegranate can cause central nervous system depression in pets.
My guess is that cats should also not ingest any part of the pomegranate, including the leaves.
Hope this helps.
Also, I included the link, the question about the pomegranates is at the very bottom of the page.
Are pomegranate leaves poisonous to cats?
Try the site below. Hope it helps.
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