I'm not sure what you are asking. All three of the grasses you are asking about are clumpers, although they may seed to a limited extent (the Calamagrostis is most likely) they don't spread by rhizomes. Festuca glauca tends to be quite short lived unless in sharply drained soil and frequently divided. The Deschampsia and the Calamagrostis prefer moister (but not wet) soils.
Last edited by MaineDesigner
on Wed Jun 18, 2008 3:08 pm, edited 1 time in total.