The word(s) "trees" appears 17 time(s) in 17 verse(s) in Quran in Abdullah Yusuf Ali translation.

(11) And the herbs and the trees - both (alike) prostrate in adoration.

(12) Containing all kinds (of trees and delights);-

(13) (They will be) among Lote-trees without thorns,

(14) Among Talh trees with flowers (or fruits) piled one above another,-

(15) Whether ye cut down (O ye Muslim!) The tender palm-trees, or ye left them standing on their roots, it was by leave of Allah, and in order that He might cover with shame the rebellious transgresses.

(16) He made it rage against them seven nights and eight days in succession: so that thou couldst see the (whole) people lying prostrate in its (path), as they had been roots of hollow palm-trees tumbled down!

(17) And enclosed Gardens, dense with lofty trees,