SOLVED: Unknown plant, maybe weed, hard to describe

Piperton, TN

We are doing a Biology project and need some help. This plant has a very dark green/purple stem. It has some feather white poofs that are probably left over from where the flower would have been. It also have pointed green leaves. This was taken in West Tennessee in mid October. Any help is appreciated.

Thumbnail by pugnation
Beautiful, BC(Zone 8b)

Maybe Prunella vulgaris
For future reference, I just google usda + plant and go into the usda plant database and on the left side click on advanced search and select county, bloom colour, family, etc.

Calgary, AB(Zone 3b)

As a hint, I agree it's Lamiaceae but it doesn't have the calyx structure of Prunella vulgaris. USDA Plants is a good place to look.

Piperton, TN

Here are a few more images to help classify.

Thumbnail by pugnation Thumbnail by pugnation
Calgary, AB(Zone 3b)

Haven't studied this too closely but suggest Perilla frutescens.

Hobart, IN

Wouldn't the Perilla leaves be pretty pungent? I've let some of the purple stuff go to seed and it will have some green offspring as well.

Melbourne, KY(Zone 6a)

I agree with altagardener--it's highly invasive here, and can be purple or green.

Lucketts, VA(Zone 7a)

Agree, Perilla frutescens.

Piperton, TN

Thank you all so much for your help! We greatly appreciate it and couldn't have done it without y'all!

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