I think that Gandalf was speaking metaphorically when he said that Sauron would "cover the land in a second darkness". Even so you bring up an interesting question, what did the Elves of Middle Earth eat before the coming of the sun and moon? Starlight is not generally enough for plants to grow. I seem to remember something about Yavanna puting the plants in some kind of stasis too, but I don't have time to look it up right now.
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If you would convince a man that he does wrong, do right. Men will believe what they see.~Henry David Thoreau
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