From what I understand there is no such thing as ficus ginseng, it's just microcarpa grown in specific way, roots above the soil or something.That is the infamous Ginseng ficus. Which is not a species, but a product form. The species is well suited for bonsai; Here is one of mine in early development stage:
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So if you will grow microcarpa from a seed or a cutting, you might still have a bag of potatoes underneath your soil.
But perhaps I'm wrong.