I think, this song is about depression and someone is trying to help him find happiness, but he can't ever see anything but the lemon tree, which represents everything negative.
He wonders why he can't see the blue sky (the good things)
He doesn't want to see the bad things, but he feels like he's in that desert, that's barren, of joy and love.
He's waiting for life to start happening again.
Just my personal thoughts,
I think, this song is about depression and someone is trying to help him find happiness, but he can't ever see anything but the lemon tree, which represents everything negative. He wonders why he can't see the blue sky (the good things) He doesn't want to see the bad things, but he feels like he's in that desert, that's barren, of joy and love. He's waiting for life to start happening again. Just my personal thoughts,