Cactus and Flower spend their days in the desert, side by side. They watch the sun come up; they watch the sun go down. They play with their animal friends. And they grow, slowly but surely. Then one day, Flower loses a petal. Cactus and Flower know what this means. But they know, too, that this is the way life goes: Slowly but surely, petals will fall, and new buds will bloom.