The Bridge by Leonard Petracci

Horatius was born a gardener aboard the ship, a generational colony vessel seeking new life among the stars. But he has always wanted to be a historian, one who remembers stories of life on the ship before it was struck by an asteroid several hundred years before. Discouraged by his father, who claims that stories cannot feed a hungry stomach, Horatius nearly gives up his dream until he discovers that stories may be the only way for the ship's passengers to survive.