My uneducated guess is Nigella (Love in a Mist).

Lovely and ferny.

Here is a link that might be useful: Nigella Foliage

Cold it be field horsetail?

Here is a link that might be useful: Equisetum Arvense

Possibly Eupatorium capillifolium, Dog Fennel. Crush a leaf or two -- if it has a rather foul odor, it's Dog Fennel.

If that is what you have, yes, it's perennial. And its considered a weed.

It's definitely not E. arvense.

I'd go with the Dog Fennel, like denninmi. Definitely not Nigella or Equisetum.

Thanks! It's dog fennel. I don't know why it is considered a weed. It's so nice looking in my garden.

TJ

Yeah, even though it is a weed and it smells funky, it's attractive. One grower on our local farmer's market was selling it this spring in one gallons for $8 each as a foliage filler for combo pots. I don't know if she came up with this herself or found it in a catalog. I know it isn't native here in Michigan, but it is commonly seen in nursery stock imported from TN, so it tends to sprout up around new plantings of things. I've seen it quite a few times growing at the base of newly installed landscape plantings.