ChineseElm wrote:

Yes. I can explain.

Firstly, I didn't know that keeping them indoors kills them.
I have read hundreds of guides saying that the Chinese elm can be placed both indoors and outdoors. I am confused now.

And second, I live in a place where it reaches SCALDING hot temps.
By that, I mean 125º F (51º C) and it's also extremely dry here.
Some days the humidity outside is around 9%!


I have no clue whether to keep it outside or inside!

you might find it difficult to keep a chinese elm in a climate without a winter and summers that are really hot... as they need considerably more humidity than that.. you might be able to keep the tree alive indoors... but it won't thrive. have a look at some of the species that grow where you live.. if they are suitible for bonsai...

Elms are tough. But the one you have there looks like it spent a lot of time in a very friendly environment. Bringing it outside in your current weather is a good way to loose the tree.

Look into finding a local club to get local advice. I am not aware of people on this forum growing trees in your sort of climate, this the advice you get does not fit your reality.