I failed to seed with winter rye last fall, and then we had an incredibly wet winter here in north Texas. As a result, the dogs pretty much ran off EVERYTHING in the back acre down to bare dirt, and now that spring is here, it's pretty clear that I've got no summer grass coming up in the back. Just weeds.
I'm aware that getting grass back into the area is my best long-term solution. But in the meantime, three things that used to just be a problem along the back of the property line have taken over the better part of an acre. This is too much to go pulling by hand, and too much to hit with roundup or something like that. I don't know what these things are, but I do know that one of them produces, later in the year, extremely hard, sharp thorns. Since these plants have taken over the entire area, if we get to the thorn stage, I won't be able to let the dogs out there at all for many months. So, the goal is to ID them if I can, and figure out the best way to get rid of them asap, before I have an acre of solid thorns.
The plants in question are D, E, and F. I suspect that E or F is responsible for the thorns.