"the trees" is correct and usable in written English.
You can use it whenever you are referring to multiple trees, such as in a sentence like: "The trees in the garden are beginning to blossom."
Dictionary
the trees
noun
A large plant, not exactly defined, but typically over four meters in height, with a single trunk which grows in girth with age and branches (which also grow in circumference with age).
Exact(60)
The trees.
The trees sway darkly.
I like the trees.
The trees were dripping.
"That's the trees whistling".
"The trees said: 'Aha!
Hate the trees.
The trees are unpleasant.
Oxford and the Trees.
Here, the trees.
The trees are still gone.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com