Baby's breath is dangerous for cats, dahlias are dangerous for cats, some roses can be but mostly itls thorns that are a concern, I'm not even sure what the leaves are but considering how many decoritive lants are poisonous to cats I would say better safe than sorry. Do not let the cats get into these if they nibble on plants.
Yes that's why I mentioned them ( actually some of what I thought were dahlias are actually mums... which I think are even more toxic to cats.) Basically this would be very dangerous for a cat to bite into or rub up against. These would be best kept in a room where the cats don't have access.