From a gardening website:
In the first place, do you have a thatch problem? Thatch is a layer of undecomposed stems and clippings on which a turfgrass is growing. Thatch is bad because the grass is more susceptible to drought and cold damage. zoysiagrass lawns don’t usually have a thatch problem unless they were over-fertilized and were mowed infrequently in the past. Before you dethatch, go out and examine your lawn grass. Is the grass growing on the soil or on a layer of thatch? If the thatch is less than ½ inch thick, you should not dethatch. A more practical reason is that dethatching is done only when the grass is vigorously growing in June. The best management of zoysiagrass right now would be to lower the regular mowing blade ½ inch and remove the brown winter stems.
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