Heady...that's the only word for the scent of this flower.

But what plant is it, please, Lori?

Ummmm.... will have to get back to you. I think Flcrazy gave me the name of it last year...it is about five feet tall and very healthy...lots of bloom and very popular with the bees and butterflies.

Not a Eupatorium of some sort, is it?

it looks like a Eupatorium... but it looks more cultured than wild and it has a very pronounced scent...and is white.
The pictures I've seen of E.coelestinum are all of the blue type and the leaves and stalks are a much darker green on the E. coelestinium than on the plant I have. If it is an ageratum it's much larger than plants I've seen on wildflower sites. Will have to do some further looking under Conoclinium coelestinum...