Today it looks like my last unsprouted rhizome is finally sprouting.
Yes, that bud that broke the surface this morning is a young Cascade. That means that if you planted the rhizomes horrizontally, 1/2~1 inch below the surface, and watered twice daily, (or as needed to keep them in a good mood) then with-in the next week, some of your slow pokes might be knocking on your door. If you were slower to plant, or didn't water, or underwatered, bathed they or planted them upside down etc., you might need some more time before giving up.
I did my best (x0.7) and it took till now for the last guy to show his face...
so don't give up yet!