Answer: poplars

AnswerCrossword Clue
POPLARSTulip trees
POPLARSCottonwood trees
POPLARSCottonwood relatives
POPLARSRapid-growing trees.
POPLARSTrees.
POPLARSTulip trees.
POPLARSTrees
POPLARSRocky Mountain trees
poplarsany of several tall, slender, fast-growing trees
poplarsPOPLAR, a fast-growing tree