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All answers having "Evergreens" as clue:

4 Character Answers:

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FIRS

YEWS



5 Character Answers:

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PINES



6 Character Answers:

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CEDARS



7 Character Answers:

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BALSAMS

REDBAYS



8 Character Answers:

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FIRTREES

HEMLOCKS

JUNIPERS



9 Character Answers:

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YULETREES



10 Character Answers:

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BALSAMFIRS