Do I need an apostrophe in "These trees’ roots"?
"Wow!!! These trees' roots are so long!"
In this example the speaker can see both roots and the trees themselves.
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Yes, you need the apostrophe.
-s' denotes possession of some thing or things by multiple owners. The roots belong to the trees; the trees own the roots. Therefore, the roots are the trees' roots.
Yes, you need the apostrophe, and you need it right where it is: make sure that the apostrophe is after the "s", not before.
-s' is the possessive ending for plural nouns (e.g. trees becomes trees'), while -'s is the possessive ending for singular nouns (e.g. tree becomes tree's).
Hence, The roots of these trees becomes These trees' roots.
And The roots of this tree becomes This tree's roots.