Hello, This is Malta Star Thistle. I have been dealing with it for a few years now. I do not use herbicides so have been pulling it up and disposing of it in trash bags. I have less and less each year. There are chemicals to control it also. Its best to jump right on it so it cannot spread. I is a noxious weed as the previous poster said. One of the worst I have dealt with. Look online for more information.

The spiny one is a Bramble. Rubus species. The other two are tree seedlings but I don’t know which species.

Can you tell us where on the planet this is growing? That makes a big difference to what it might be.

You might already be in the period past when the grass is finally greening up. In fact you may never have seen dormancy in your area, but the point is to be past the spring green up before using Weed-b-Gon. It should take care of your broadleaf weeds in zoysia. If that does not work in 3 weeks, then, since it is growing like a vine, you might try a totally different approach. I have had excellent success killing vining type weeds by sticking just the tip of one vine into a concentrate of 42% glyphosate. I used a bud vase and propped it up next to a cactus in the garden. I stuck the vine into the vase until it was in the liquid. I wasn't sure anything was happening until, SUDDENLY, the entire plant was dead, about 30 feet across. I had no idea how prevalent the weed was until it was dead.