I am the largest cactus in the United States, a slow-growing, branching columnar cactus.

My most iconic feature is my tall, ribbed, green trunk and the characteristic arms that curve upward, which I begin to develop after 50-75 years of age.

My skin is covered in a waxy coating to reduce water loss, and my 2-inch spines cluster in groups on my ridges.

In late spring, I produce large, white, night-blooming flowers that open after sunset and close by midday. These become edible red fruits.

I am native exclusively to the Sonoran Desert in Arizona, the Mexican state of Sonora, and small areas of southeastern California.

I am a master of drought survival. My pleated trunk expands to store hundreds of gallons of water after rare rains.

In cultivation, I require infrequent but deep watering. Soak the soil completely, then allow it to dry out entirely for weeks or months.

Overwatering is fatal. I am extremely prone to root rot. In winter, I need almost no water.

I require perfect, fast-draining soil and cannot tolerate any standing moisture.

I am a full sun desert giant. I require maximum, unobstructed sunlight all day long.

I cannot thrive in shade or even partial shade. Insufficient sun leads to etiolation (weak, skinny growth) and eventual death.

I am built for the most intense, direct desert sunlight.

I thrive in extreme, dry heat and am suited only to USDA zones 8b-11.

My ideal range is hot days (above 32°C) and cool nights. I can survive brief freezing temperatures down to -4°C if perfectly dry, but sustained frost or wet cold is lethal.

I am a landscape monument for large properties in desert regions only. I am not a houseplant.

Planting must be done with extreme care. Even small specimens are heavy. Always hire a professional to move or plant large Saguaros.

Soil must be native, rocky, sandy desert soil with perfect drainage. Do not amend with rich organic matter.

I have a shallow, wide root system. Give me vast space—at least 3-4 meters from structures and other large plants.

I do not require fertilizer in native soil. In extremely poor, cultivated soil, a light application of a low-nitrogen, cactus-specific fertilizer once a year in spring is maximum.

More harm is done by over-fertilizing than by not fertilizing at all.

Scientific Name: Carnegiea gigantea

Common Names: Saguaro, Giant Cactus, Sage of the Desert

Plant Family: Cactaceae

Plant Type: Perennial, branching columnar cactus

My spines are a severe puncture and laceration risk to pets and people. While not chemically toxic, physical injury and infection are the primary dangers. Keep pets away.

As a massive, long-lived plant, I am a significant carbon sink, sequestering carbon dioxide over centuries. My contribution to local oxygen production is substantial but relevant only in my native desert landscape.