It also notes that there is a variety, Milium effusum 'Variegatum' whose leaves are variegated in white. This is supposedly a striking plant, but a weak grower. Being a variegated foliage nut, I'd love to get my hands on one of these. Bowles' Golden Grass is well worth adding to your shady garden. It is found in the moist woods of Europe, across Asia to Japan and in the northern United States and southern Canada.
Sources are mixed in giving hardiness ranges.
It is evergreen, but my guess is that those in colder climes may find the foliage is only partially evergreen, if that. But this wide range of hardiness zones seems to indicate that it merits a try in just about any garden. In the garden, it wants light to fairly deep shade, although the leaf color won't be as intense in really deep shade. When you think about siting it, keep your location in mind and remember that plants can take more sun in northerly climates. Both loosely and densely tufted grasses increase the size of their tufts by an internal division of the number of culms that grow from any one rooting point.