Thanks! I'm glad we aren't too near the brook too, as the brook mint is likely too similar to them as well -- the brook mint may be a descendent of peppermint, from when peppermint oil was briefly an export of Ashfield.

Huh. I forgot to list Oregano in my post, but that's pretty self-contained too (as far as hybridizing with the others).

Thank goodness the lower garden is on the other side of the house from the south gardens... I have to keep the two kinds of Dill separate as well.