Sometimes variegated plants such as zebra grass (Miscanthus sinensis ?Zebrinus?) revert back to their natural forms. Usually the solid green form of the plant is more vigorous than the striped or variegated form, so it will overtake the desirable variegated portion of the plant. When this happens, there?s nothing you can do except replace the plant with another variegated form. Depending on the time of year, the stripes in your zebra grass may return. Zebra grass is a warm-season ornamental that prefers hot weather. Often the first shoots that emerge in spring are solid green. As temperatures warm, additional new shoots develop the characteristic striped variegation.