It very well could be. The habit shown in the pic just reminded me of the Boysenberries that we used to pick on a friends farm as a kid in zone 5.

I see that now, as I read, thanks. The leaves reminded me so much of a crown of thorns house plant I used to have, but I know that house plant does not get berries.

I am excited to hear that Echinaceas will bloom the first year from seed. I winter sowed lots of Echs last year, and I'm anxious to see what they look like! Mostly hybrids, so who knows what I will get - probably all plain purple. :) But it will be nice to find out this year.

I'm not familar with weeds in your region. But for assistance with ID, take a good-sized sample to a local large independent garden center or to your county's Extension Serivce office.