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All answers having "Evergreen tree" as clue:

3 Character Answers:

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BAY

FIR

YEW



4 Character Answers:

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PINE



5 Character Answers:

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CAROB

CEDAR

LEMON

OLIVE



6 Character Answers:

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LAUREL

ORANGE

SPRUCE



7 Character Answers:

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CONIFER

JUNIPER

MADRONO



10 Character Answers:

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ARBORVITAE