Grasses need more sun.
I’d suggest cimicifuga although we’ve never had it in our selection at Hewitts.
More on that here: https://www.thespruce.com/actaea-or-cimicifuga-1316020
Clethra, a woody plant might be another option and we’ll have them in a couple weeks
More on that here: http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c230