Native to tropical and subtropical Asia, this tree grows in warm, humid conditions where roots have access to air as well as steady moisture. That background explains why the best soil for Ficus microcarpa 'Ginseng' is loose, moisture-retentive, and still quick to drain.
Its thick, swollen roots store some moisture, but the finer feeding roots still prefer oxygen around them. A loamy, slightly sandy, organic-rich substrate suits that balance well, holding enough water for even hydration while preventing heavy, compact conditions that can limit root function.