Hi Everyone,

My name is Patryk and I come from Poland. 
I’m new to the Bonsai. At the beginning of October time I bought a Bonsai Zelkova. 
Unfortunately it was overwatered and leaves started to change its colour to black. On 25th of October I changed its soil but I afraid that there is something wrong with it. Its leaves are very dry. I don’t know what to do. The Bonsai is in shadow place, because at the window is a little bit cold.
Could you tell me if this could be the reason, please?
Could you help me and tell what to do, please?
Thank you.

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This is not a zelkova, but a chinese elm. It is a teperate tree that grow best outdoors in most temperate regions. Growing it indoors is quite a challenge that most of the times ends up in failure.