Cactus with pods

Since I showed lots of water and beach last week, I thought I'd go in the other direction by showing this photo. We don't get a lot of rain here so to save ourselves from incredibly high water bills, many people in my neighborhood have cactus and rock gardens. At its highest point, this cactus from a neighbor's yard is about 10 feet/3 meters tall. I've been waiting for these pods to turn into some kind of flower, but so far nothing has happened.