I have a major thistle problem across the ditch about 30 yards by 30 yards or so. It was just unmowed grass but thistle took over whole patch. I will look out for that thank youA quick one...I see a little thistle in your stand...as such, my advice is to get after that and not let it get going on you. I have spot mowed it AND also spot sprayed it to get "little spots" under control. A couple of years ago though I had enough that I had a big sprayer come in and hit it and it really knocked it back. So depending on how much you have, you can choose your level of attack...but don't let it be IMO.
Otherwise, it looks like a pretty good stand to me.