Been reading online a bit today. The flat spot out back is 7000sqft. Suggestion is to do one plug for every sqft = 7000. Granted, not every sqft of that area needs fixing, but it's gonna look weird to have a grass species like that next to fescue, KBG until it eventually takes over. IDK what to do. Apparently zoysia seed is difficult to grow, requires a lot of water early on and only works well if starting from topsoil. The more plugs you put in the faster it spreads, but from what I read, 1-3yrs or so. I'm tired of waiting to have a good decent looking lawn, so not sure I want to put in the effort of plugging.