Someone just asked a question about it on DG and I also googled it. Not a lot there. But I found a reference to a "truly large hosta". A search at myhostas.be did not bring it up.
It DID bring up:
Blue Wu Jim King 2010 'Skylight' x 'Empress Wu' View Details
Empress Wu Brian & Virginia Skaggs 2008 'Big John' hybrid View Details
Empress Wu streaked 'Empress Wu' sport View Details
Princess WuWu Linda Port & Linda Cunningham 'Empress Wu' seedling View Details
Xanadu Empress Wu
But I think this one may also be 'Xanadu Princess Wu'. At least I found a reference to that as well.
