Frilly leaves and black seeds
This plant is crowding my blackberries. At this point in the season, it is everywhere in the planter box and I don't know how to get rid of it. I thought an ID might help.
When it gets big enough, it produces v-shaped branches with black cone-shaped seeds. I didn't see any flowers.
I appreciate any tips. One thing: I have a lot of bird seed in my yard, so if it's not a weed, it would be that.