My next door neighbor has nothing in his *BACK* yard but crabgrass and henbit. Virtually all the zoysia he had is now gone. He says, "Well, as long as it's green...." [chuckle]
He did fix up his FRONT yard, though, which was also going to pot with a ton of weeds--everything from foxtail to plantains to crabgrass. He paid $500 to his weekly lawn-mowing company to use a machine to aerate his front yard in September and plant a cool-season seed mixture, which looks like its fescue, annual or perennial ryegrass, and maybe a bit of bluegrass. He told me he also personally hand-sewed a whole lot of "Canadian Green" after they aerated. His front yard is about 1,500 to 2,000 square feet.
So the zoysia he once had in *front* is now almost all gone, replaced by the tons of weeds and the newly planted cool season grasses. But of course as I mentioned earlier, his *back* yard is nothing but crabgrass and henbit.
You'd think for $500 the company could have done both his back and front yards, which probably total about 3,000 square feet. But all they did was his front yard. Oh well. He's a good customer too. He let's them cut his lawn every single week whether it needs it or not. And they always cut it way too low. Maybe I should talk to him about it, but I haven't.
My other neighbor also gets his lawn cut weekly, but by a different company, yet this company also cuts his lawn way too low. After every cut, Neighbor Number 2's zoysia lawn looks brownish, having had much of the green cut too low. I don't understand why these lawn companies do that. I haven't uttered a word about it to either neighbor though. I don't want to meddle, I guess.