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So I have this what I believe is a Japanese Juniper and I have been watering it only once the soil starts to become dry and yet this white substance (pictured below) which I assume is mold has formed at the base of my trees trunk. Could you please tell me what this is or how to get rid of it?

I hope you only took it inside to take the picture. I doubt it os mould on the trunk, have you tried removing it? Water and a toothbrush gently rubbed should be enough

Ill try removing it right now. I've been keeping it inside under a light and I mist it regularly because when I had set it outside it started to wilt and die and ever since I've had it inside it has prospered

Put it outside and det it get used to the sunlight slowly. Inside it Will die.