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Hello folks

Recently re-potted my Chinese Elm tree and while it's looking healthy and all, it seems a smaller tree started growing as well; (photos attached bellow). By the time I'm posting this it's gotten even taller and definitely looks like a small Chinese elm wannabe tree.
So, my questions are:
Is this normal? Does this happen often? How does this happen/What caused it?
And more importantly, what do I do?? Do I leave it alone? Is it going to grow and fight over for water and resources with the main tree and choke each other out?
Much appreciated for any information.

Looks like weed to me.

Your tree is suffering and needs to move outside asap.

Hi. Thank you for your reply. Can you elaborate a bit more? What makes you say that and what can I do? How is moving it outside going to help it?

If anything, I left it by the open window and it seems like the intense heat and sun we currently experiencing in London UK is actually too much for it;
It was doing poorly, I re-potted it in new appropriate soil, it boomed with growth, but now suddenly starts being poorly again. I dont understand if I'm watering it too much, not enough, if it needs sun or less sun. It's honestly really confusing.

Then suddenly this seedling popped up and Im not sure if it's a threat to the tree or not. I've taken another photo of the seedling and tried to compare it to images I see online. Looks similar to me?
I guess what Im mainly wondering about is, is it a threat to the main bonsai? The roots competing etc.

I am not sure how to elaborate in a way that makes you satisfied.

The "plant" does not look like a chinese elm seadling or sucker. Hence I would say weed.

We have hundreds of "help my bonsai is dieing" threads here at the forum. Almost all of them is trees growing indoors. Many are chinese elms. This time of the year this species should have 100s of 10-20 cm long new shoots with tight internodes. Its soon mid summer and your tree has not yet grown the spring flush. That is a tree suffering and repotting will not help. In fact repotting an unhealthy tree is often the way to push it over the edge.

I would just remove the weed and move the tree outdoors. First in shade and then gradually move it into full sun during a period of a month or so.

I hobe that is elaborated enough.

Hey Tony, I second completely the comment above.
If you don't have a patio, maybe a balcony should be enough.

Trees are pretty simple genomes, which means there is an environment they evolved in and they don't adjust well to a different environment. They expect changes in season. They expect periods of sunlight with several hours of strong sun and then several hours of absolute darkness. They expect heavy rainfall from time to time that washes the leaves off. They expect humidity levels that they evolved in, usually way over 40-45% that us humans expect. They expect heavy winds from time to time.

They don't watch advertisements for air conditioning that tells them it is awful outdoors and they need to buy expensive equipment and they need to burn fossil fuels. They don't want weak indoor light for hours during dark periods.

In short, they need to be outside.

You say intense heat. Here the highs are 98F/36C and next week will be hotter. There are hundreds of trees outside all doing just fine. July will be hotter and August worse. The trees will do fine.

They need an environment like where they evolved.

Thank you for taking the time to explain. I know it sounds obvious to you, but I'm new to bonsai and for some reason every article I read says chinese elm trees are also indoor trees (?). But everything you said make sense and it's been my suspicion too. Thanks again.

Yes, that is sad. But people want indoor trees so the industry produce and sell indoor trees.

Sometimes a picture can tell more than words.

This is my elm right now. This is what a healthy elm looks like after spring push and before first summer pruning.

Yeah, that's what I thought as well. They just say whatever to sell you stuff.

Thank you for the information and for showing me that photo of your tree as a reference point. I've since moved mine outside and am monitoring it. I'm not entirely sure how often or much fertilizer I am supposed to use, but Im following some videos I saw online.

Fertiliser every two weeks is fine, or if solid then put it on the surface and it gets a bit each watering