Quote:
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In mediaeval mythology green represented nature; wild, uncontrolled, mysterious and not to be trusted. Green was worn by ladies of doubtful reputation (as in the song "Greensleeves") and was very rarely used in heraldry
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Hmm, that sets me thinking about Rohan. Not to be trusted? I don’t think it would apply in that case.
As for Bilbo’s green door, let’s not forget that Gandalf saw Bilbo as having grown somewhat stagnant. Perhaps he shut that green door on the outside world and was happily moldering life away in the comfort of Bag End.
This question seems to deal with whether Tolkien used color symbolically or as an emotive trigger.