I always assumed that (like the barrow-wight said) Legolas was just poetically explaining how he saw the world...
But then again, there might be more to it. Elves always had a strong connection with nature, and Legolas being a wood-elf might have had a strong connection with trees. Besides that in Fangorn Legolas says (or something similiar to this) "And I might come to understand their thought in time." He was taliing about the trees (Ents) before he knew they were Ents so possibly he (and all other Elves) can communicate with nature.
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"And if you listen very hard/ The tune will come to you at last/ When all are one and one is all/ To be a rock and not to roll." --Led Zeppelin "Stairway to Heaven"
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