If it is an herb, rub the leaves and take a whiff and that should identify it for you.

If it smells like mint...it is mint. If not, my best guess is oregano.

It isn't Oregano and it's a pretty odd looking Mint. I would suggest some kind of Perilla about to flower.

I was wondering if it is perhaps a Salvia. Regardless, it does look intentional, repost when you see flowers. Perilla has fairly unobtrusive flowers on a spike at the top.

The flower photo doesn't look like it's Perilla. Is there only one purple flower at the node? And there are no long flower spikes with numerous tiny flowers?

If them stem is square (4-sided) it is a mint.

Yes, no spikes

The stem is square. I looked up all kinds of mint, and it resembles corn mint the most. I'm just so confused. How in the world did I get corn mint? Now I think that when I ordered seeds, that they put wrong seeds in the package. I have another package of seeds that produces something completely different then what was purchased. I need to find a better way of labeling, that does not get washed off. It's driving me nuts. Thank you all for your help.

BTW, it does not have really minty taste or smell to it. I had the same problem before identifying chocolate mint. Not very minty. Oh well, I have to rip it out, since it will become invasive. It's going into some smoothies, and the chickens will love it, too :-)

It isn't corn mint. And while all mints have square stems not all plants with square stems are mints, or even members of the mint family, the Lamiaceae.

What about a Scutellaria?

Somebody said it could be Chia. Is it possible that in a new plant there is only one tiny little flower instead of a spike with flowers? Thanks.