每日吃瓜

I recently purchases a bonsai tree.
I tried looking up the species and couldn't identify it, if anyone can help.

I had it near a north facing window. Unfortunately as it's now winter, I think it may had been too cold. I was also watering it once per week. I noticed the leaves began curling and moved it to the kitchen. Now the leaves look very curled up. Can you help and identify if this is normal? Is it just fall for the tree and leaves are falling? Do I need to save it or fertilize it?

Difficult to identify the species, why did you not ask when you bought it? Now it is stressed badly, not enough light, too warm, and probably under watered. Very few species of plant will live in the dark overheated environment of a house. This plant may or may not survive, but it id not looking good.

Thanks - It was a gift. I don't believe it is too warm as it started to look weak near the window (which is really cold). Any tips on how to save it?