That's really not a bad problem to have, if your having trouble with zoysia growing. I have a problem in my back yard where the zoysia is eroding away from being on slant, so I planted St Augistine plugs to take over that area. I would just check to see if that grass you think is St Augustine, is not "Torpedo Grass" which is really a weed grass, that grows underground, and spreads pretty quickly. I dug a lot of that out in back yard, that was coming from my neighbors house. Very hard to control.
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