Possible Clues:

• Tuber that's often candied
• Starchy tuber a woman raised
• Major vegetable export of Nigeria (nearly 70% of the world's total)
• Veggie
• Root vegetable that Nigeria is known for
• Some dilemma year-round in the US plot
• Thanksgiving dinner offering
• Candied root vegetable
• Orange or purple vegetable
• Sweet potato relative