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Zoysia prefers mowing to 1 to 1-1/4 inches in full sun and between 1-1/2 to 1-3/4 in part sun to part shade. When you mow Zoysia, your goal is to have the target height after having removed only 1/3rd of the grass with each mowing. So if your Zoysia is in full sun, you should wait until it reaches 1-3/4 inches and remove just over 1/2 inch. If it's growing in shade, wait until the grass reaches about 2-1/2 inches and remove just over 3/4 inch. Keep your mower blade razor sharp!