Description: Fine-textured grass with silvery seed heads.
Growth Habit: Clump-forming perennial. 2ft height
Sun/Shade: Full sun.
Water Needs: Low; drought-tolerant.
Soil Preferences: Well-drained, sandy or loamy soil.
Benefits: Great for erosion control and naturalized areas. Adds texture to dry landscapes.
 
From Prairie Moon Nursery: 
June Grass is also known as Prairie Junegrass and Koeleria cristata. This native, widely-distributed prairie grass will flower earlier than many other upland prairie grasses.  Its plumes of silvery-green seed heads turn tan by mid-summer.  The foliage supporting these seeds is also an attractive green-gray color.  June Grass actively grows during the spring and fall when soil temperatures are cool and likes full sun and dry, often sandy, soil.  Its preference for dry, sunny conditions makes it a popular candidate for green roofs.