Telperion and Laurelin were the greatest trees to exist. The only source of light in the world after the destruction of the lamps and before the creation of the Sun and Moon. With leaves of gold upon the one and leaves of silver upon the other, they shone with a beautiful light that the Sun and Moon are but pale imitations of. Ungoliant destroyed these trees, draining their light and increasing her might. Somehow, two seedlings of the trees have survived and ended up in your hands. These seedlings, when planted will sprout and over the course of a few years grow into new trees with the same light. These are hallowed and sacred things. Bring light back to this realm, or perhaps hoard it for yourself and see what you can gain from exploiting such great lights.