I'll be getting the Ortho at HD for now to get the few random spots I have. For next season I think I will buy the powder in a larger quantity online unless Scotts puts out a liquid concentrate. Thanks for the info!

I wouldn't recommend that as the minimum temperature for poultry is 165°. You'll get worms*. :-) The point is that plants are fairly heat tolerant--they regularly deal with surface air temperatures in excess of 100 degrees and do it pretty easily. Surface soil temperatures can ride hotter than that for short periods of time and the plant manages. Seeds are even more durable. Some require 160° for a full day before they're assured dead. And even then there can be surprises. Wet soil is a great heat sink, but has enough mass and absorbs enough heat that you have to apply an enormous amount to get a significant amount of the mass to rise high enough to kill root systems. That's the reason that solarization is done over fairly long periods of time. Plus as tap roots re-sprout into the heat zone, the new sprouts are constantly killed until the root is tapped. * We're six months off the proper season for that, but still.

Shot weed, Cardamine hirsuta. An annual that grows very early season and has an ability to 'shoot' its seed pods - those long skinny things at the tip of the plant - considerable distances, hence the common name :- ) And it produces seeds in copious abundance!! Ideally, you want to remove as soon as you see the foliage rosette forming in early spring - very shallow rooted and pulls up easily - but certainly once you see any flowers forming and before it goes to seed. Now all you can do is treat with any lawn broadleaved weed killer. But as it has already dispersed a huge number of seeds that will not be addressed by this, prepare to reapply several more times as they continue to germinate before the weather heats up. And it will likely reappear in fall as well.

Your pictures are not close enough to identify the weeds. I do see what looks like morning glory and English Ivy at a minimum in what is no doubt a whole community of weeds. You might be better off identifying any plants of value worth saving as a start if they exist, weeding around those, cutting everything else to the ground, letting it regrow enough leaves so it can all be sprayed with an herbicide and killed to give you a blank slate to start over.