Zoysia versus Bermuda
I've seen at least 4 different "lawn care" or "lawn mowing" companies doing business in this neighborhood. (Schucks, I'll just refer to them as "lawn companies" so as not to disparage the good ones but also not compliment the bad ones.)
My neighborhood is mostly zoysia lawns, but there are a couple Bermuda lawns down the street and a fair number of cool-season lawns here too. Pretty much everything goes in the Transition Zone of St. Louis. Lotsa variety of lawns from warm-season to cool-season lawns.
One of the lawn company employees I was talking to said he's been cutting grass for 25 years, so I asked him what kind of grass made up the lawn he was cutting down the street, since I wasn't sure myself. He didn't know the name of the grass. He described it as more of a weed. It surprised me that he couldn't come up with the name of the grass, because I later found out it's just plain old Bermuda grass.
My lawn is 90 percent Zoysia and 10 percent Fine Fescue (I have an area in the backyard which is solely Fine Fescue).
However, in back I also have a few small patches of Bermuda grass here and there. The Bermuda doesn't make up more than 1 percent of my total lawn right now.
When the Zoysia and the Bermuda finally meet, which will win? Right now they're separated by some weeds. Will the zoysia take over the Bermuda or vice versa?