A white ring ¼ up the trunk with a “wet” appearance (but dry to touch) on a 5-year-old Ficus bonsai is puzzling. It could be a wire or tie left from training, mineral deposit, or pest residue.
Do not repot. Bonsai are kept in small pots intentionally. Repotting defeats miniaturization. Pruning (top and possibly roots) may be needed, but only with experience.
For Ficus and bonsai guides, email wcreed@HorticulturalHelp.com.
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Ficus Leaf Drop: Watering by Weight and Light Needs
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