These ornamental grasses have a clumping or bunching growth habit. Though they do spread by an underground root, as all grasses do, they form new shoots at short intervals, so they do not wander outside of the area you want them to grow. These plants are all native to North America.

• Wavy hairgrass (Deschampsia flexuosa, Zones 2 to 7)
• Tufted hairgrass (Deschampsia cespitosa, Zones 1 to 7)
• Mexican feather grass (Nasella tenuissima, Stipa tenuissima, Zones 7 to 10)
• Northern sea oats (Chasmanthium latifolium, Zones 4 to 7)
• Switchgrass (Panicum virgatum, Zones 3 to 9)
• Giant sacaton (Sporobolus wrightii, Zones 6 to 9)
• Prairie dropseed (Sporobolus heterolepis, Zones 3 to 9)
• Little bluestem (Schizachyrium scoparium, Zones 3 to 9)
• Big bluestem (Andropogon gerardii, Zones 4 to 10)
• Hairawn muhly (Muhlenbergia capillaris, Zones 5 to 9

Related posts:

1. Native Ornamental Grasses
2. Q&A: Ornamental Grasses for Shade
3. Plants We Love: Hairawn Muhly Grass