Crossword Genius

With yam and fertile ground, here one may trace roots (6,4)

Ross

I believe the answer is:

family tree

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'here one may trace roots' is the definition.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for family tree that I've seen before include "Genealogical chart" , "Personal history" , "Chart of relations" .)

I've seen this clue in The Times.
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