Common name: Rose Fountain Grass, Purple Fountain Grass 'Rubrum'
Plant Link: http://plantsdatabase.com/go/1491/
That is such a stunning grass. I'll bet it really stands out in your garden.
This has also been sent to the hill outside the back fence. With water and fertilizer it will easily reach 7-8' tall and as wide in one season. With no irrigation and no fertilizer in solid clay soil it stays at about 4' tall.
Needs to be sheared to the ground in the Spring to get rid of the dead leaves and promote new growth.