Q: We live on a property in the near foothills on the east side of town that has a number of saguaros. There is one cactus that we’d always assumed was just an odd looking saguaro because it is about the same size as many of the saguaros in our yard. This morning, we noticed that it has two blooms and they are quite different from those on saguaros. We also realized that while the spines are similar to those on a saguaro, they differ too. Can you help us identify this cactus?
A: From your photo this appears to be an Argentine saguaro (Echinopsis terscheckii), aka cordon grande. This species is sometimes planted in our area for its ability to withstand cold weather. It grows faster than the native saguaro and is hardier so it can be grown in slightly colder climates. As you noticed, the flowers look more like a cereus than a saguaro and the spines are longer as well.
Peter L. Warren is the urban horticulture agent for the Pima County Cooperative Extension and the University of Arizona. Questions and photos may be emailed to tucsongardensage@gmail.com
