The stomata on the leaves open up and let in more carbon dioxide when blue light interacts with them. In essence, more carbon dioxide equals more energy for the plant to thrive.
Water, soil nutrients, and carbon dioxide are all crucial components of the photosynthetic process. Although we are unsure of what is happening on a cellular level when blue light interacts with plant leaves, we are aware that blue light promotes photosynthetic activity.
MORE: Red and Blue Light: The Ultimate Guide