Some of the hop varieties are proprietary and are unavailable for growing. :-( Simcoe, Amarillo and Citra or the ones that come to mind.
If you can get your hands on it, share!
Haven't had the opportunity to get to this one yet unfortunately. I had Ettaler Curator Dunkeler Doppelbock and thought it was pretty special. I wanted something similar to it. I loved that brew!