Nepeta faassenii is also known as catmint or catnip due to its interesting effect on cats. If you have cats you should definitely grow this, theyll love it. It sends them a bit mad though! The nickname cannabis for cats is well deserved! Its a perennial with veined grey green leaves and pretty pale purple trumpet shaped flowers that grow on stalks. Remove the spent blooms to encourage more flowers to grow. The seeds are usually sterile so this one wont take over your garden if you let it go to seed.