Cactus and Flower — Sarah Williamson

This bright, gentle, thoughtful picture book explores friendship and natural life cycles for readers young and old
 
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.