It works on weeds, grass, trees, shrubsThere is an app called "plantnet" you take a picture of the plant than pops up the name. I'm assuming it would work on weeds. I did it on a big dandelion bush.
I think so to.Bottom one looks like ironweed ?
I think you better look at the top picture again. It doesn't look like your picture of IronweedEveryone is correct, it is Ironweed.
Giant Ironweed (fs.fed.us)
I believe they mean 2nd picture is ironweed and first maybe verbena.I think you better look at the top picture again. It doesn't look like your picture of Ironweed
Leaves and stem look like milkweed from what I can see .
I was basing it on the second picture. I have a few of those in one field now.I think you better look at the top picture again. It doesn't look like your picture of Ironweed