We grow cat mint in our garden (thought it was catnip for years, didn't know the difference). The plants are 2-3 feet high and really bushy, and if you put 5 of them together they make a really nice shrub. Well - Toby likes to make a little cave in the middle of them every year. It's his little secret opium den! When he was little he'd go bonkers from the stuff. Now he just sleeps in there. It's so cute!