I don't rightly know...... I have a litte patch of mint out back as well. All the other herbs are dead, I think, but the mint keeps on growing!! I just use what I can, I need to look up some more stuff to do it....
I used to have catnip back there too. Needless to say, the neighbors cat loved it very much.
-Banti
The neighbors' cats don't need encouragement to destroy my property. They like that is mostly clutter free and mowed. It is quieter over here too.