Outdoor Cedar Wood + Boiled Linseed Oil = Fire?

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I am making an outdoor organic raised bed garden out of Cedar wood but would like to preserve (as well as protect) the color f the wood by applying boiled linseed oil. First off, is this an organic way to go? I've heard that it could destroy with mildew? Secondly, will my graden combust and catch fire? I've also heard of its flamable nature...

Is this ok? what should I do?