Hard to tell from this altitude and the lens Vaseline factor. Are those tiny yellow flowers? If so I would suggest it might be horse herb. That can be tough to get rid of or easy depending on your lawn type. Where do you live? What kind of grass do you have? Can you be more specific about the brand and name of the 2-4,d product you used? They're not all the same. Furthermore if you have St Augustine, you may have killed the grass with that spray.

I don't know how the squirrels get to it, but I'm going to replace it with a squirrel-proof feeder. I have one of those already and can get another one. I do not want to be feeding the squirrels or encouraging them in any way that I can avoid.

3 days after my last post, someone sighted a deer on my street. That is the first (and hopefully the last and only one) to get this far into town.

agree .. you might be best off removing it.. and cycling in a new crop for fall ... in 60 days.. you could have a lettuce or radish crop .... if not sooner ... im surprised it produced so early ... unless you started with a largish plant .... perhaps.. if you started from seed.... it would have bloomed more in fall.. like i would have expected .... ken