Plant ID please

Please help me identify this plant,

I try to grow a lot of things and always put seeds in the ground. Somethimes they turn into plants years later, when I forgot all about them. Birds drop all kind of things as well. The wind might blow something in. I have plants growing that I am sure I have never sowed myself (but appreciate them no less).

For at least two years I have a plant growing in a pot, I have no idea what it is. Google lens gives me a different identification for every picture and all identifications it is definitely not. The only picture I found on internet, that looked like it, belonged to a person asking if anyone knows what it is.

I have to ask you permies, because I haven't got a clue. I need to know whether I have to find a good spot for this plant in the garden, or is it not worth it?

I need to know whether I have to find a good spot for this plant in the garden, or is it not worth it?

just a wild guess, but could it be American bladdernut - Staphylea triloba?


image from carolina nature

I'm not sure, because your leaves seem to come from alternate sides of the stem each time, rather than in a plane like the bladdernut.

It definitely looks like a tree or shrub.

Those leaves look opposite to me. That was my first thought too, although I’ve never seen the plant in person.

Maybe, just possibly it could be a young Sambucus nigra (Black elderberry) which I think grows in your part of the world.   Definitely has leaves growing in threes at the end of the stems, but more usually has a further two lower down the stem when older,  see :-
https://allrareherbs.com.au/product/black-elderberry-plant/   If so this is a handy addition to the garden, berries have all sorts of properties, flowers make a great wine.
There are dangerous leaf look-a-likes, so best plan to wait for a flower and/or fruit appearance.
Edit to add:  does anyone have an image of the leaves of an older plant for comparison - elderberry doesn't grow near me.

Thank you all for identifying my plant.

I think you might be right on the bladdernut. I have tried to sow that years ago for someone else and it failed. Maybe one did not...
It grows nearby, so I will have a look at the leaves and stem of it. In my mind the leaves are more feathered, so with more than 3 leaves on one stem, but Nancy's  picture shows the tree leaves clearly. I think the picture is from a more horizontal branch, therefore the arangement of leaves looks a little different. When I looked very close, I do see the perpendicular leaves as well, just like in my picture.

I don't think it is sambucus. Sambucus was one of googles suggestions as well. It definitely has some similarities, the leaves of Elderberry that I know are more feathered for sure. It surprises me that Jill's picture clearly shows 3 leaves...? However, the very distinctive smell is missing. A sambucus is a great plant indeed, it grows in my garden, and all over the place around here. When touching the leaves or cutting the stem it smells very particular.

Does anyone know how to prepair blatternut? Does anyone eat the nuts?