Has this been outside in 6a all winter? ie is it hardy in your zone? Does it have a scent? Does it have a square cross section stem? Could we see the whole Plant?

Thanks floral-uk for your help. No, these plants died off in the fall of 2011 once the cold weather set in. The plants did have a scent but unfortunately I don't remember exactly what it was like and I don't remember the stems as being square but I could be wrong on that. This is the only other photo I have of these plants. I can add that none of the plants grew more than about 6 inches high before flowering. Any further help is much appreciated. Thankyou.

Hi there,
could it be Ageratum?
scroll down in the blogg, there is a pic,

bye, Lin

Here is a link that might be useful: Agetaum seedling

Thanks for the suggestion Lin. I was told that it's likely Chocolate Mint or something close to that. Any further help is much appreciated. Thankyou.

A mint as in Mentha would have very strong rhizomes near the surface,
and IME they hardly selfseed, just run.

Does it have any scent at all?
Very curious

Looks a lot like the chocolate mint I grew in the past - oregano leaves are fuzzy & those look smooth.

my guess is also mint but no square stems

Just saw some chocolate mint at my local big box store today; looked just like your plant.

Thankyou all for your comments and suggestions.