No continent depends as much on root and tuber crops in feeding its population as does Africa.
From the en.wikipedia.org
The cost per 1,000 calories of yam is four times greater than those of other root and tuber crops.
From the en.wikipedia.org
While grain yields have risen dramatically since the 1970s, the productivity of root and tuber crops has stagnated.
From the newscientist.com
Its mission is to work with partners to achieve food security, well-being, and gender equity for poor people in root and tuber farming, and food systems in the developing world.
From the en.wikipedia.org
Arrowhead root with an edible tuber is common here, as are maples, lizard's tail bushes with white bottlebrush-like flowers, also swamp mallow and its cousin marsh mallow.
From the stltoday.com
Divide clumps and if a good shoot is detached from the tuber, don't throw it out but put it in sandy soil to root.
From the odt.co.nz
Horseradish root is very potent and can sting the eyes, so make sure you keep the tuber at arm's length while chopping it in a well-ventilated room.