Posted: 29/03/2015 at 14:53
Miscanthus like morning light and calamagrostis Karl foerster are tall grasses that will work well with rudbeckias. However, miscanthus is much taller than any variety of rudbeckia.
Shorter grasses like deschampsia will match the height of most rudbeckias......and they enjoy the same conditions, viz., slightly damper soil.
stipas are not really for screening......STIPA gigantea is tall but rather see through