My bee balm has been dying off for about 3 years. I now have very little off. Any suggestions? I have inundated with slugs, do they eat the roots?
This does sound unusual for Bee Balm, as it can become invasive.
Slugs would not dine on the roots, they would prefer leaves, though Bee Balm is not usually effected by Slugs.
Check the soil, is it well draining?
This article will refresh you on the growing conditions and may help pinpoint the issue.