Cerulean's life shatters when a disaster kills all Firth except him. The song trees that shared caretaking of planet Lenglood with his kind are silenced by the tragedy. Grief-stricken, Cerulean struggles to survive and revive the trees. When colonists show up, he has more to lose--Lenglood itself.
Songs of Distant Earth by Arthur C. Clarke
The Death of Grass by John Christopher
Into the Forest by Jean Hegland