Hackelia perhaps? Where are you located?

Western NY State.

Hackelia has thin leaves. These leaves are quite large.

Looks a bit like echinacea to me. Do you know it is a weed, or is it quite possibly a flower in a flower garden?

As a weed look up creeping bellflower. If that's what it is, get rid of it, ASAP and never, ever let it flower.

Yes, it could be echinacea. THere used to be some about 10 feet from the photo.

Given the size of the leaves, it looks more like foxglove to me....

Was able to zoom in and see that it’s not foxglove. Glad I don’t have Hackelia.

Agree w/Jay about the quilted surface -- the leaves in the pic are too rugose for coneflower (Echinacea). I've become a big fan lately of coneflowers (butterflies seem to like them more than any other flower on my lot) and planted several more.

Its a Borage family reunion. Nydpot would you know what the plant behind the Stickseed is? I looks kind of cudweedish.

We do not get Hackelia here, so if that popped up in my garden I'd say it was probably Green Alkanet, Pentaglottis sempervirens. Have you handled the foliage? Is it slightly bristly and do you get itchy hairs in the skin?

I pulled it out. No issues with it. It came out in one big clump.

In that case it wasn't Green Alkanet!

The focus has been on the blue flowers. It was the large, green leaved plant front and center that I was concerned about.

The blue flowers are coming out of the heart-shaped leaves to the right, which is bugloss. They are also in the background.. The flowers are mixed in with the pearly leverlasting, which can be confusing.

I wasn't looking at the blue flowers, which I knew were Brunnera, only at the foliage plant. However Green Alkanet is in the same family, Boraginaceae. But if it pulled out easily and didn't make your skin itch it's not Alkanet.

I've heard Alkanet mentioned in a British gardening group, but I doubt most Americans have heard that name. It sounds very similar to Comphrey. It has agressive rhyzomes and it's an excrllent addition to compost. I searched to see what chemical caused skin irritation, rashes and blisters and it has no toxic chemicals it's the hairs themselves that cause blisters. Maybe Alkanet had convergant evolution with tarrantulas that use their hairs as a defense Lol. What exactly do Comphrey and Alkanet posess that makes them so beneficial for compost?

Comfrey is good for compost because the roots go very deep gathering nutrients and it produces a lot of foliage. In appearance it is not particularly similar to Green Alkanet, especially in flower. Comfrey is a British native. Alkanet is not.

Alkanet is listed as a noxious weed in Washington State https://www.nwcb.wa.gov/weeds/green-alkanet

I grew Comphrey once several years ago. I removed it after hearing all the horror stories about how agressive it was. It continued to send up shoots for a few years after I removed it. The Comphrey flowers were similar to our native Virginia Bluebells, Mertensia virginica. Are you familiar with the genus Lithospermum? We have the majority of that genus in the Americas. They are quite stunning in a wide range of foliage and flower. Some have yellow and orange flowers.

Here are my coneflowers (Echinacea) for comparison to OP's plant. New ones have been planted on either side. Tips have been pinched on big ones to help keep from getting too tall. Wikipedia says they bloom in summer, but these bloom all the way to autumn frost.

ComFrey. Symphytum officinale is native here and common in damp watersides.

Yes, I know Lithospermum but we only have a couple of natives here.

gromwells - very fond of 'em