How do you cultivate a jicama?

My jicama sprouted before I could eat it and my curiosity and love of plants took over so I let it grow. I know it's a vine and is supposed to have showy flowers but I have no idea if I can keep it growing to the point of blooming. It has some big 3-part leaves and it's vining away (hope I have room) but the tuber/bulb is shrinking. I water it cautiously. Now what?

How do you cultivate a jicama?
How interesting. I will try it too.

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