One of the most favorite ornamental grasses I have is Karly Rose a pennisetum orientale. I wasn't sure when I first planted it if it would take because it was just in our zone .. and sometimes that just doesn't work .. every garden has a micro climate and thankfully mine is fairly well insulated .. I have grown Golden Jubilee Hyssop for 4 years (just loosing the mother plant this Spring but I have babies .. phew !
In any case .. this grass has been such a wonderful surprise for a few years .. I have actually moved it and worried that I most likely made it mad at me and it would up and leave my garden .. but no .. another phew ! I do have to bind it after it comes out .. sort of mid July because heavy rain can make it look very sad and droopy .. but it has a Venetian obelisk to cling to and actually you can't even see it when Karly is at full tilt it grows that high .. I would recommend this as a feature grass for wow factor in any garden !