Experts and BHG readers answer.
Clumping or Running Grass
You have ornamental grasses featured, but do not list whether they are clumping or running. I am very nervous to inadvertantly plant a running beast.
Of all the ornamental grasses featured in the plant encyclopedia, only variegated ribbon grass (Phalaris arundinacea 'Picta') and Japanese bloodgrass (Imperata cylindrica) can be considered runners. Variegated ribbon grass is described as "fast-spreading". The red form of Japanese bloodgrass usually remains under control, but the green form can spread invasively.
This does NOT include bamboos, which often are spreaders.