Doesn't it grow well for you, Chelle? It's like mint, once growing you can't stop it. I think sometimes it's best to just ignore it, but keep it potted. Otherwise it's non stop everywhere.
Although I did lose my lemon mint by saying the exact same thing a few years ago.
And come to think of it, I haven't seen the horehound since last summer's drought
Maybe I should keep quiet, but I do love horehound candy. Good thing they still have it at Cracker Barrel.