Out of 26 planted rhizomes, there are 18 growing. I'm not completely giving up on the other 8, but still I bet they're gone. Not a problem - in a year or two, I'll just split a crown or two and plant them in those empty spots.
Here's a "map" of the yard. X means there's a plant growing.
Centennial | XXX_X | XXX_X | Cascade |
Golding | __XX_ | X__XX | Chinook |
_XXXXX | Zeus |