Usually mould appears in organic wet soils, or around organic slow release fertiliser.
Maybe overwatering it? Is the place around your bonsai too humid?
It’s been sitting in the sun room and it’s watering itself, I put water in the pan below and it sucks it up. It’s winter out so there’s not a lot of humidity. I hope this pic is better.
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It’s been sitting in the sun room and it’s watering itself, I put water in the pan below and it sucks it up. It’s winter out so there’s not a lot of humidity. I hope this pic is better.
You have got mold because you put it in a pan with water which it sucks up.