What is an example of an inedible root?

Question

What is an example of an inedible root?

Answer 1

Pine tree roots.  Fir roots.  Mangrove roots.

Answer 2

Oak tree roots.

Answer 3

Roots of datura is non edible and also poisonous.

Answer 4

Many roots are inedible. A better question is which are edible? There are many. Carrots, beets, potatoes, yams. There is a shorter list of edible roots than there is of inedible roots.