I used one of them - vine I think it was, but can't quite remember as it's about 3 years ago now. I had an young adult cat and introduced 2 new kittens and the flower remedies were recommended to calm the aggression that he was showing towards them. He was playing too roughly, as he is a big cat and they were so tiny. I don't know whether the Bachs did it, or just time, but they get along famously now.
I put it in wet food, as my cat prefers to drink from taps or anywhere except his bowl.