Bermuda grass seeds can sit in your soul for years before germinating, chances are it was there before the zoysia was planted. There is actually products that can be used to kill the Bermuda in a zoysia lawn without damaging the zoysia grass, unfortunately there isn't anything for St Augustine grass without killing it also. The Bermuda usually blends in with the zoysia fairly decent but when it's in St Augustine grass it is an eyesore.
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