SPREADING GRASSES
These varieties spread SLOWLY and should not be confused with the aggressive, invasive ones. All are quite well behaved in average garden conditions and serve a useful purpose in the right location.
Achnatherum calamagrostis Spear grass
Alopecurus 'Aureo-variegatus' Golden foxtail grass
Andropogon gerardi
Big bluestem (sod forming)
Carex glauca (flacca)
Blue sedge
Carex muskingumensis
Palm sedge
Luzula sylvatica
Greater wood rush
Panicum virgatum
Switch grass
AGGRESSIVE GRASSES
They provide a quick and easy groundcover over large areas and help stabilize slopes for erosion control. Most can also be planted in smaller gardens if growth is controlled with an underground barrier or if planted in a large pot that's sunk into the ground.
Glyceria maxima 'Variegata' Manna grass
Leymus (Elymus) Lyme grass, all types
Phalaris, all varieties Ribbon grass
Spartina in wet conditions Cord grass
Miscanthus 'Robustus' Giant Silver grass | 
