Pink cloud 

Muhlenbergia capillaris is also called muhly grass, native to arid and semi-arid habitats.  They are warm season, clumping grasses.

Variety:

Muhlenbergia cap. 'Pink cloud' (pink muhly grass)    leaves are glossy rich green, 2' tall     flowers are delicate, pink and abundant. 3' tall    zone 5     extemely drought tolerant, best in full sun     blooms in late summer with masses of airy flowers

Spectacular in a large container!