Thank you for your response! I greatly appreciate it. I decided to dig some of it up and put it in a planter last night (Since being so close to my other plant was making me nervous). I noticed that all of the stems were like interconnected to the same root system. Noticed a smell, but to me it wasn’t good. Stems were bent inward under the mulch and when I tried digging one up and removing it, I noticed it pulled on some of the others nearby as well. It had thick roots at some places. And I had to pull out a whole group of them at the same time due to the roots/stems being interconnected? Was almost impossible to only get one at a time. Roots mainly ran long and level.

Top picture looks like monarda. But… I’m not seeing square stems… What else can you tell us? Are the leaves scented? Anything that grows that profusely… Can probably stand to have some of it potted up… After you verify that it survives being transplanted, it won’t be so painful to remove the rest. There are so many plants that do not survive being transplanted that I’m hesitant in advising anything other than a take it slow approach to an unknown plant.