The color makes me think of lemon balm. But if it has a minty smell to it, with full smooth sawtoothed leaves like that it is most likely spearmint. Have you tasted it?

I think it is cuban oregano, Plectranthus amboinicus.

FataMorgana

definitely NOT Cuban Oregano. That is a succulent, with round thick fuzzy leaves. These leaves are pointed, smooth surfaced, and thin.

Check out google images for cuban oregano. Seems to vary some in habit and appearance - probably different varieties but I still say Plectranthus amboinicus. You can ask on "Name that Plant" for many other opinions, if you wish.

FataMorgana

Here is a link that might be useful: Google Images - Plectranthus amboinicus

I am pretty sure that the original photo is more closely related to the mints in the lamiacea family than it is to Plectranthus amboinicus. Here is an article I wrote a couple years ago about Cuban Oregano. http://dtlherbsltd.blogspot.com/2011/02/herb-of-week-cuban-oregano.html?m=1
We have grown it for several years now and have really enjoyed it.

I would certainly say it is not lemon balm or spearmint.

Perhaps the OP can tell us something about the scent?

What about a Salvia such as S guaranitica?Or S 'Black and Blue'?

It could be a salvia, that makes sense. It may be easier if we knew how tall it grows, and whether it grows in clumps, or spreads randomly.

But I agree, scent is the best clue. Especially with lamiacea since so many look similiar.

Is it fruity sage- salvia dorisiana, with a fruit scented peach smell, soft bendable leaves?
Compare to the picture here: http://www.colonialcreekfarm.com/search.asp?keyword=salvia+dorisiana&search.x=0amp;search.y=0amp;search=GO

or the broadleaf thyme cuban oregano, with a strong lemon thyme scent, with thick leaves?
http://www.colonialcreekfarm.com/Cuban-Oregano-Broadleaf-Thyme_p_47.html

I hope this helps

Perilla frutescens/Shiso

that looks a lot like Indian oregano, called karpooravalli. I remember munching on it when i was a kid. very strong flavor. It was never used in cooking though. More like a medicinal herb.

This post was edited by archoo16 on Sat, Apr 6, 13 at 11:37

I agree with Act 2, it looks and sounds like it may be Broadleaf Thyme. From the literature out there on the internet though, it seems that it often gets lumped in with Cuban oregano and that they're considered interchangeable. However, I just today bought one Cuban oregano plant and one broadleaf thyme plant and they look very different and have similar but distinctly different scents. See pic (Cuban oregano on left, broadleaf thyme on right). It was in trying to learn more about these plants that I came across this post.

Old post but check out:

http://upload.wikimedia.org/wikipedia/commons/d/d7/Plectranthus_amboinicus_(2).JPG

http://pics.davesgarden.com/pics/2013/06/02/tathisri/ddc80e.jpg

http://upload.wikimedia.org/wikipedia/commons/thumb/0/03/Plectranthus_amboinicus_Húng_chanh.jpg/1024px-Plectranthus_amboinicus_Húng_chanh.jpg

And so on.....I guess my opinion hasn't changed in 2 years. :) The cuban oregano plant does seem to have different varieties/leaf types. More than that I can't say.

FataMorgana