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.

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on September 18, 2021
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:
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