Describe symbolism in Out of the Dust by Karen Hesse

The cereus cactus works as both metaphor and symbol. Billie Jo could not look at the cactus wither and die because that process reminded her of her mother's death; the petals would burn and wither in the sun as her mother's skin was burned and withered. The cactus also serves as a symbol for perseverance, in addition to the night, which becomes a symbol for a time of nourishment. In the dark hours a thing of incredible beauty blooms because it has survived; Billie Jo will, too.