This is the second time an ornmental grass has been awarded this honor: in 2001 it was Karl Foerster's feather reed grass (Calamagrostis x acutiflora 'Karl Foerster'), another of my all-time favorite plants.
In my garden I grow golden Hakone grass with 'Golden Tiara' hosta and purple-leaved oxalis, a non-hardy summer bulb plant. The grouping at my side entry garden (shown above) looks lovely all season long.
If you have partial shade and moist, humus-rich, well-drained soil, this slow-growing grass will do well for you. More information about growing it is at my web site. See golden Hakone grass.