A lot of websites say they form tubers but they are actually tuberous roots.


I never noticed the difference until someone here mentioned it. Sweet potatoes
and other tuberous roots look like tubers, but if you look carefully at the
eyes, they only sprout little feeder roots. Only a true tuber has eyes which
produce leaf buds.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"When you come to a fork in the road, take it." Yogi Berra