Q.Sunchoke Produced Tremendous Growth Above Ground But No Rhizomes At All.
The stems range from 10 to a little over 15 feet tall and are very robust. A plant died and after removal and digging underneath it, there are no rhizomes or signs there ever were any.
Certified GKH Gardening Expert
It is possible a rodent of some kind beat you to it. Make sure the sunchokes get plenty of water as that will promote good tubers. Here is more on their care: