This is the 7762nd most frequent Swedish word.
trädens
"Trädens" means "the trees'" (possessive form in Swedish).
Here, 'trädens' is the possessive form meaning 'the trees’'. It indicates ownership of the leaves.
Trädens löv faller till marken på hösten.
The trees' leaves fall to the ground in autumn.
In this sentence, 'trädens' refers to the shadows cast by the trees, showing possession.
Vi promenerade längst trädens skuggor.
We walked along the trees' shadows.
Here, 'trädens' describes that the branches belong to the trees, employing a possessive relationship.