don't think I would have planted something this close to the other plants

This is a guess: Cardiospermum grandiflorum

greene said:This is a guess: Cardiospermum grandiflorum

That looks like a good guess!

Are the stems ribbed?

http://www.iewf.org/weedid/Car...

I see from USDA Plants that Cardiospermum halicacabum, an invasive vine, is naturalized in New Jersey. Not sure it fits though?
http://www.google.ca/search?q=...

More photos of Cardiospermum grandiflorum:
http://www.google.ca/search?q=...

I'm gonna suggest a hardy perennial, maybe Actaea cordifolia?

They are so similar!

Actaea pachypoda is similar too, the leaves look to vary ..

https://gobotany.newenglandwil...

Actaea rubra ..

https://gobotany.newenglandwil...

There is a key ..

https://gobotany.newenglandwil...


1) Actaea x ludovici B. Boivin

2) Actaea pachypoda Elliot

3) Actaea racemosa L.

4) Actaea racemosa L. var. racemosa

5) Actaea rubra (Aiton) Willd.

6) Actaea rubra (Aiton) Willd. ssp. rubra

http://luirig.altervista.org/f...

Can we wait until it makes flowers? Looks like this could be an interesting plant.

Looks a little ribby. . Stripped green and purple

I left it for 2 weeks now just wondering.. not one of my typical weeds.. but I have been to plant swaps up in New England.. and PA .. I know the plants that are sort of close came from PA running tiarella.. and a hardy begonia

Both Cardiospermum and Actaea have alternate leaf arrangement. Your "weed" is opposite leaf arrangement.
Don't know what it might be.

Well, sure, if you're going to point out "facts"...
Thanks, Rick! I'll try to save that in the memory banks, such as they are these days.

Leftwood said:Both Cardiospermum and Actaea have alternate leaf arrangement. Your "weed" is opposite leaf arrangement.
Don't know what it might be.

Are you sure you haven't got that the wrong way around for Actaea Rick?

https://gobotany.newenglandwil...

Tiarella was mentioned but it doesn't appear to have ridged stems..

https://www.google.co.uk/searc...

it's not the Tiarella.. for sure.. it's pretty low to the ground.. the weed is close to 2 foot.. but might have hitchhiked with one of the other plants

You know it's not poison ivy? In the photo it looks close enough that I'd be cautious.

I kinda like it for Clematis virginiana

Clematis virginiana has ribbed stems! It does look like it's shooting off like a climber.

https://gobotany.newenglandwil...

Great photos at that site. There seems to be stipules at the leaf junctions shown on one photo (for Clematis virginiana, that is) - not seeing that on the plant in question. Clematis certainly seems likely.

By the way, the photos of the plant in question show a plant marker that I can't read... nothing to do with this plant, I take it?

I noticed that also but thought it was part of the irrigation system. Is it a plant label?

It's a two-prong anodized aluminum plant marker with a yellow label, and is pulled out of the ground and lying sideways.

I think the plant label says Iris Jumping.

Oh, right, I thought I could make out "Iris", too.
Would stipules only occur at the leaf junctions near the flower heads? I would imagine they'd be at all leaf junctions?