Dominique
I do not think that I am very good at interpretation, but I think it means that people tend to gravitate toward positive people.
Lôn
It means they are phototropic.
Captain Matticus, LandPiratesInc
I've never heard this before, but it sounds to me like it means that eventually, we all must submit to the powers-that-be. We will always be beholden to the will of that which gives us vitality.
Anonymous
It means the song writter only knows about sunflowers and not much else...