Here's what it means:
* Leaves rustling: The sound of leaves moving in the wind is often described as a whisper.
* Communication: The phrase suggests that the leaves are communicating with the breeze, sharing secrets or stories.
* Gentle movement: The "whisper" implies a gentle, delicate movement of the leaves, rather than a forceful gust of wind.
So, in a nutshell, "leaves whispered to the breeze" is a poetic way of describing the gentle rustling of leaves in the wind.