Although sun damage is the most common cause of brown leaves on succulent plants, there are many other reasons for discoloration. Remove the burnt leaves, and move the plant to a shadier spot for a few weeks. If you notice that the lower leaves of your plant are falling off, it may be because they have different layers. Tokyo suns are star-shaped flowers that bloom in summer. They stay vibrant year-round, but fade to a lime green color if they don’t get enough sunlight. Add a small amount of fertilizer in the spring to encourage flowering.