Florecer means "to bloom" or "to flourish". It's a beautiful, poetic verb that can describe not just a flower opening, but also a person thriving and reaching their full potential.
In the song, the line "Una tormenta puede hacerte florecer" (A storm can make you bloom) is a powerful metaphor. It suggests that difficult times, like a storm, can lead to personal growth and reveal an even greater beauty, tying into the song's hopeful theme of patient love.
This song uses a beautiful central image to talk about waiting for someone you love: sunflowers. The singer compares their constant waiting to how sunflowers follow the sun, repeating the line, "Los girasoles nunca dejan de girar" (The sunflowers never stop turning). They see this separation as a natural cycle, just like the moon has to wait for the sun, or the tide goes out only to return to the shore.
There's no doubt in the singer's mind that this person is coming back. They state it as a fact: "Yo sé muy bien que tú te fuiste / Tú sabes bien que volverás" (I know very well that you left / You know very well that you will return). In the end, this incredible patience pays off. When the person finally returns, the singer says, "Mil girasoles te esperaron al llegar" (A thousand sunflowers waited for you to arrive), showing that their faithful, unwavering love was there all along.