An epithet properly of plants with tuberous roots, but more often applied to those bearing true tubers.
The Century Dictionary (Public Domain)
Use "tuberous-rooted" in a sentence
"In colder districts, tuberous-rooted cannas and dahlias should be dug up and stored in just-damp compost in a cool, airy place."
"It resembles the potato in that it is a tuberous-rooted vegetable, and grows readily enough — in fact, perhaps it grows too readily, for once it takes possession of the soil it is difficult to eradicate it."
"A hardy tuberous-rooted perennial from North America."