The most common cause of color change in hosta is light, either too much (relative to the plant's requirements,) or too little. Have you had this variety for at least several seasons, and find it is suddenly changing? If so, you might want to consider the light where it's growing, and if you want the cream edges, see if there's a place in your garden to move the plants where the light is more like that they had in earlier seasons. This article might be helpful: https://www.gardeningknowhow.com/ornamental/foliage/hosta/transplanting-hostas.htm
Answered on January 29, 2015
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