Well there you go Nicole. Makes perfect sense now.
Here in NC it stops raining in April and starts back in December, (at least the last two years.) I had to transplant most of my sunchokes to a shady, damp spot to get any decent sized tubers. I may plant some groundnut seeds in that patch of chokes and see what happens. I've got only and handful of seed so the main thing this year is getting them started. Thank you both for your input.