I found this in a guy garden who usually has interesting plants. The head has small spikes in it that kind of hurt when I picked it up. It has tiny black seeds like celosia seeds. So I think it's a type of celosia but it was fairly large. The dead plant came up to my hip, so like 3 feet high. Any help would be great
checked out picture of dock and I don't think its that. The seed capsules are much smaller
I think an amaranth seed head could be spiky when dry, and would have tiny seeds.
I also thought that that too. But I'm trying to think of amaranth with black black seed. Because the seeds look just like yellow amaranth seeds but just black