That is really cool. I have a black thumb when it comes to growing stuff. I have a catnip plant that I've been able to keep alive that was started from a cutting. Catnip is obviously hard to kill.
You could dry it and make herbal tea from it. It’s good with relaxing herbs like chamomile or red clover. Good for nerves and insomnia. It tastes good, too. Although if you have cats, they’ll try to go after your teapot. lol