I saved seeds from physostegia ‘Miss Manners’ and they look good, but I bagged the double cosmos seeds before they were dry and mold got to them.    From Wordnik.com.  [Fun With Seeds 2010 « Fairegarden] Reference

If something is a mint relative, you should check whether it is invasive in moist soil, as are bee balm and physostegia, though not all share this trait.    From Wordnik.com.  [Oregano, basil and other members of the mint family dominate the herb garden] Reference

My flower garden has hosted numerous mint relatives: bee balm, lamb's ears, lamium, ajuga, physostegia, coleus, catmint, calamint, bells of Ireland, perovskia, endless salvias and even a few shrubs such as caryopteris.    From Wordnik.com.  [Oregano, basil and other members of the mint family dominate the herb garden] Reference