We have catnip growing in our yard, and have had for years. It is impossible to get rid of it, so we just enjoy it. That is to say, some family members enjoy it. I was out pulling weeds the other day, so I also pulled a catnip plant and brought it in.
The cats shared for a while, then there was a little discussion:
Things smoothed out, and they were soon happily rolling and playing. A long afternoon nap was the final result of the fun.