I see that the life of this place is always emerging beyond expectation or prediction or typicality, that it is unique, given to the world minute by minute, only once, never to be repeated. And this is when I see that this life is a miracle, absolutely worth having, absolutely worth saving. We are alive within mystery, by miracle.
Wendell Berry
Cactus are adapted at living in very dry environments and because of this show many adaptations to conserve water. The cactus spines prevent cactus from losing water by reducing air flow around the cactus which can help reduce evaporation. The trapped air around the cactus can also create a buffer zone with slightly more moist air. In areas of fog cactus spines can also help collect dew, which will drop onto the dirt near the cactus and be absorbed by the roots. Cactus spines help preserve water by providing a bit of shade. Since a given cactus can easily have thousands of spines, the little bits of shade adds up. One of the most obvious benefits of cactus spines is that they keep predators away. Lots of desert herbivores love chomping on cactus just to get at the water stored inside so the spines can reduce this. The point is they help the plant survive in its harsh environment. And, the point of this post is… life is a miracle and worth saving!
