Random seedling from tuber

in Plants
One of the things I love about this time of year all the random seedlings that pop up in various pots.
In one of my Japanese Maple pots, this very long thin root seedling with a tuber appeared. Anyone have any idea what it is?

In one of my Japanese Maple pots, this very long thin root seedling with a tuber appeared. Anyone have any idea what it is?



0
Posts
But at night something climbs into the pots - even the tallest ones - and digs around.
I wonder if it was a bird?
Either way I don’t have space for an oak.
You are very fortunate not to have squirrels!
Our garden isn’t anywhere near big enough for an oak tree although I would love one. If I just put it in a container I’m prepared to root prune and all of that stuff… would this work? I’m not talking bonsai just a regular 20 L pot or something.