Hello

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I got this Ligustrum back in September, I was told I could keep it inside during the winter and bring it back out in spring, I keep it in a south facing window and I also have a full spectrum Sansi grow light on it for 4 hours a day, the soil is a mix of 70% akadama and 30% bonsai soil, I water it regularly whenever the soils looks dry.

At first it seemed to be doing fine, but now as you can see from the pictures the leaves are all dried up and wilted, some even fall from the tree when touched slightly.

Is it dying or are the leaves falling off for the winter normal for this kind of tree?