Fools Garden - Lemon tree ( SUBTITULADO INGLES - ESPAÑOL )

http://www.isabelperez.com/songs/lemon.htm

http://en.islcollective.com/resources/printables/worksheets_doc_docx/lemon_tree_fools_garden/present-continuous-beginner/69402

The boy is sad and thinks about his girl. The blue sky refers to the promise of love but he doesn't believe it. Lemon tree here stays for something very common and not special?
Lemon tree signifies 'fidelity'.
A lemon (tree) is also sour, while love is sweet.
A lemon tree is yellow, while the sky is blue (complementery colours).
A lemon tree is firmly rooted in the earth (stuck in one place, like the man); the sky is limitless, like love.
The girl has told him about the sky, but all he sees is the tree – hence his unhappiness. He cannot see beyond the limitations of the lemon tree.