Evaluation location: Wisconsin, United States
We grew 15 seedlings of each population in 6" clay pots in the winter greenhouse 2007-8, 2008-9 and 2009-10 for tuberization. Tubers were harvested when mature, and bulked by population. They were not peeled. They were washed, weighed, and frozen, then freeze-dried and weighed again. Percent dry matter for each population is average of dry wt / wet weight over the three years.