Tree in a nickname for Washington State (9)

I believe the answer is:

evergreen

(Other definitions for evergreen that I've seen before include "having no garden shed?" , "box, perhaps" , "Source of wood" , "Leaves of holly and ivy are --" , "Enduringly popular" .)

I've seen this clue in the Universal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.