I'm not planning to give them to my pigs - a friend who has pigs was asking me if they could have them. But, I did not know the answer to that and could not find it any place. Searched the forums here too, and nope. She has a student from China living with her who asked if they could have it, and then she asked me...so now I'm asking everybody else! I've never even heard of lemon leaves. I know I don't give my guys lemons because of the sour.