Blue Muhly Grass. Muhlenbergia rigens, Grass Family ( Poaceae ), Blue Muhly Grass. Also called Muhly Grass, Big Muhly Grass, Lindheimer's Muhlygrass, Blue Muhlygrass. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Blue Muhly Grass has bluish gray foliage that grows in a clump 2 - 4 feet wide and 1 - 2 feet tall. The purplish flowering spikes stand above the foliage and they can be up to 5 feet tall. They appear in early fall, starting out purplish, then becoming gray later in the summer and throughout most of the winter. It tolerates alkaline soil; extremely drought tolerant. Moderate to little water, cannot tolerate poorly-drained soils. Once established, it needs no care. Quick Notes: Height: Height normally about 28 - 36 inches tall. Will also spread to about 48 inches. Flowers: Purple - gray flower panicles. Flowering Time: Phoenix Arizona. Mid August - September. Leaves: Simple, gray - green; medium blade width. Found: The USDA claims it is native to the USA (TX). Also found in northern Mexico in the states of Chihuahua, Coahuila, Durango, Nuevo Leon, Sonora, Tamaulipas, & Zacatecas. Hardiness: Claimed to be hardy to 0 �F. But that seems to mean root hardy only! USDA Zone 7a: to -17.7 �C (0 �F) USDA Zone 7b: to -14.9 �C (5 �F) USDA Zone 8a: to -12.2 �C (10 �F) USDA Zone 8b: to -9.4 �C (15 �F) USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) USDA Zone 11: above 4.5 �C (40 �F) Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) Sun Exposure: Full Sun Elevation: 0 - 4,200 Feet. Habitat: Native of the dry prairies and rocky slopes in Texas and northern Mexico. Miscellaneous: Photos Taken At Boyce Thompson Arboretum. Photo Taken October 11, 2006. A Xeriscape Landscape plant.

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