Autumn Moor Grass forms a 1' tall clump of stiff narrow blades that are bright green with a cast of yellow. Produces narrow, 2.5" silvery white flowerheads in fall that contrasts nicely with the foliage. Considered hardy in Zone 5, it has done well at the Minnesota Landscape Arboretum and is worthy of using with caution in Zone 4. Clump forming.