My cat behaves very strangely if it eats silvervine. There's no need to worry about it. If your cat eats this frequently, it will not have a strange reaction. Cats have a strange reaction to silvervine if they are not used to it. Silvervine is kind of creeper that grows on mountains.
Cats like to eat the branches and leaves.
If your cat goes outside, please don't cut its claws. They are needed for climbing and gripping. If you cut their claws, it is dangerous for them. For indoor cats, it is considered quite good to cut their claws. Then they won't cause injury to people.