What You Should Know about Saguaro Cactus
Are you intrigued by saguaro cactus---those desert icons depicted on everything from bath mats to baby rompers? If you're wondering if you might be able to own one, here's what you should know.
Online info can be misleading
When I noticed that a national magazine's list of "Cactus You Can Grow at Home" included saguaro, I heard someone squeal "What?!" and realized it was me. Granted, the article does state that saguaros will grow indoors as baby plants, but the accompanying photo shows a mature specimen about 30 feet tall in a desert garden. The plant has two upraised "arms" and is about as iconic as one can get. But don't expect a saguaro to look like that in your potted collection. For one thing, they're armless poles until 75 to 100 years of age.
Most importantly, you can NOT have a saguaro in your garden unless you live in the Sonoran desert. Saguaros thrive throughout southern Arizona but nowhere in California. However, in Baja California there do exist even larger cacti sometimes confused with saguaros: Mexican giant cardon (Pachycereus pringlei), shown below. It's a different genus that branches from the base and blooms along its ribs. You can grow cardons in Southern CA...if you have room.
Additionally, saguaros are "very slow growing" according to the website of Tucson's Arizona-Sonora Desert Museum. "A 10-year-old plant may be only 1.5 inches tall." With two miles of walking trails on 21 acres, this outdoor museum is well worth a visit, and a great place to see saguaros. In Phoenix, the Desert Botanical Garden, one of the finest botanical gardens in the US, showcases saguaros and other desert flora. For a more rugged experience, there's the Saguaro National Park, located both east (67K acres) and west (25K acres) of Tucson. Note that temps may exceed 100 degrees May-October, and the region's summer monsoon season is July-August. Consequently, most visitors go November through April.
Saguaro Cactus (Carnegia gigantea) at a Glance
-- Pronounced "sa-WAH-ro"
-- Largest cactus in the US
-- Grows only in the Sonoran Desert (southern AZ - northern Mexico)
-- Lives 150+ years
-- Attains 40+ feet in height
-- Grows first side arm after about 75 years
-- Accordion-like ribs expand after rainstorms
-- Ribs shrink as it draws on stored water
-- A fully hydrated saguaro may weigh two tons+
-- Blooms are white and waxy, late April - June
-- Flowers open at sunset, close mid-afternoon
-- Nocturnal pollinators are bats attracted to nectar
-- Fruits are edible, ruby-red and ripen in June
-- Typical of cactus, spines serve to shade the skin
-- Harming a saguaro is illegal in Arizona
-- Homeowners need permits to remove them
-- There exist "saguaro rescue" services.
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Thank you,for valuable information. Already notice too many misinformation in line. Because of you, I grow to love succulents. It’s only a year I has began collecting and knowing them. Love you, God bless
Thanks, Lizzette! It can be hard to be noticed beneath an avalanche of misinformation. Comments like yours make what I do worthwhile!
Happy New Year, Debra Lee. Met you and heard you speak for the GCA a few years back. After an unusually hot, dry summer, two of our saguaro exhibit pink/purple areas on the flesh down low by the ground, only on the south sides. This is only the case on the two we installed last February, and not so with ones already on the property. One has several arms and is about 15’; the other is a “spear” about 5’. Do you have any ideas on identifying the newly colored flesh? Would be grateful for your guidance please. Megan
Hi Megan — It’s probably nothing and will likely outgrow it. However, if it turns black instead of green, Google “saguaro necrosis.” Here’s a post that might interest you, in a Facebook group you might find helpful: (Arizona Cactus & Succulent). https://www.facebook.com/groups/ArizonaCactusandSucculent/permalink/3725507907515052
Thanks very much. That post is similar to one on AZ Wildflower & Cacti. M
Saguaro cactus grow in both San Bernardino and Riverside counties in California. In both locations directly adjacent to the Colorado River. A large colony of them are found directly across from Parker Arizona. They are rare in California but do in fact grow there
Good to know, Erik! Thanks for the clarification.