I think the tune was composed by somebody who felt the mystery and beauty of a shady grove of trees. Quite possibly it was a person who spent all day sweating in a hot field or working in a hot, clanky mill.
Unfortunately, some turkey came along later and decided it needed words, probably merely for the purpose of recalling the tune at a dance. Whoever it was composed the most obvious, work-free words possible.
I think we should deep-six the lyrics and honor the memory of the composer.