Well, the goatheads (AKA puncturevine) are back. I was just outside and saw some of them sprouting. They're a problem over much of the west. There were quite a lot of them on my property when I moved here, but as I learned about them, I've reduced them by probably 70%.
They still pop up though, especially on roads and bare areas, and I think the cows help spread them along their trails. Steve absolutely hates them. He removes them from his paws with his mouth, and he's really good at it, but I'm still always afraid he might swallow one. I always keep an eye on him when we walk and have for the most part trained him to wait for me to remove them from his paws.
They die really easy with 24D, but you have to stay on top of them. I'll do a full patrol for them one day, then a couple days later there's at least as many more that have popped up. I've taken to keeping a 1 gallon sprayer with 24D in my UTV and just stopping to spray them whenever I see them, to try and get them before they flower and make the spikey seed heads.