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trichocereus pachanoi identifying san pedro cactus

trichocereus pachanoi identifying san pedro cactus Buy San Pedro Cactus Phoenix, AZ | Echinopsis pachanoi

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Description

trichocereus pachanoi identifying san pedro cactus Buy San Pedro Cactus Phoenix, AZ | Echinopsis pachanoiA Towering Columnar Cactus for Phoenix Desert Gardens San Pedro The San Pedro Cactus (Echinopsis pachanoi) is one of the fastest growing columnar cacti available for Phoenix landscapes. Native to the Andes Mountains, this striking blue green cactus grows tall, ribbed columns that branch with age into dramatic multi stemmed specimens. San Pedro can reach 1020 feet tall in the Phoenix Valley, adding bold vertical structure to xeriscape gardens,

A Towering Columnar Cactus for Phoenix Desert Gardens — San Pedro

The San Pedro Cactus (Echinopsis pachanoi) is one of the fastest-growing columnar cacti available for Phoenix landscapes. Native to the Andes Mountains, this striking blue-green cactus grows tall, ribbed columns that branch with age into dramatic multi-stemmed specimens. San Pedro can reach 10–20 feet tall in the Phoenix Valley, adding bold vertical structure to xeriscape gardens, courtyard plantings, and modern desert designs. It produces spectacular large white flowers that bloom at night during summer — a rare treat for any garden. Whether you’re creating a sculptural cactus garden in Scottsdale, anchoring a Chandler desert border, or adding architectural drama to a Mesa backyard — San Pedro delivers fast growth and jaw-dropping form.

San Pedro Cactus Plant Details

Attribute Detail
Scientific Name Echinopsis pachanoi (syn. Trichocereus pachanoi)
Common Names San Pedro Cactus, Saint Peter Cactus
Mature Height 10–20 feet
Mature Width 4–6 feet (multi-branched clump)
Growth Rate Fast for a cactus — 1–2 feet per year in Phoenix
Sun Full sun to light shade. Handles reflected heat well.
Water Low once established. Drought-tolerant but appreciates occasional deep watering.
USDA Zones 9–11 (Phoenix is Zone 9b–10a)
Soil Well-draining required. Thrives in sandy, rocky Arizona soils and handles caliche with drainage.
Foliage Evergreen — blue-green ribbed columns year-round
Bloom Large white nocturnal flowers in summer — fragrant and spectacular

San Pedro Cactus Uses in Phoenix Landscapes

Sculptural Focal Point & Cactus Gardens

San Pedro’s tall, ribbed columns create dramatic vertical architecture in any desert garden. Plant a single specimen as a living sculpture in a Scottsdale courtyard, or group 3–5 for a columnar cactus grove effect. Pair with Golden Barrel, Totem Pole Cactus, and Mexican Fencepost for an all-columnar desert statement garden.

Modern Desert Borders & Property Screens

Because San Pedro branches and fills in with age, it makes an effective living screen or border plant. Space 3–4 feet apart along a Chandler property line or Gilbert fence to create a striking green wall. The columns grow fast enough to provide meaningful screening within 3–5 years.

Pool-Friendly & Low-Litter Plantings

San Pedro is an excellent pool-adjacent plant — it produces virtually no leaf litter, requires minimal trimming, and its smooth columns and minimal spines make it safer than many cacti. Plant along Tempe and Mesa pool perimeters for a clean, architectural look with zero maintenance debris.

Best Time to Plant San Pedro Cactus in Phoenix

Spring (March–May) is the ideal planting window. Warm soil and rising temperatures promote fast root establishment and active growth. Fall (October–November) is the second-best option. Avoid planting in winter — San Pedro is slightly frost-sensitive and roots best in warm soil.

How to Plant San Pedro Cactus

  1. Dig wide, not deep — excavate 2x the root ball width at the same depth. Cacti have shallow root systems.
  2. Ensure excellent drainage — break through any caliche layer. San Pedro will rot in standing water.
  3. Backfill with native soil — no amendments needed. Sandy, rocky Arizona soil is ideal.
  4. Spacing — 3–4 feet apart for a border or screen; 5+ feet for standalone specimens.
  5. Let the cut callus — if transplanting a cutting, let the cut end dry and callus for 1–2 weeks before planting.
  6. Gravel mulch — 2–3 inches of decomposed granite or gravel. Never use organic mulch that retains moisture.

Watering San Pedro Cactus in Phoenix

First Year Watering Schedule

  • Weeks 1–2: Every 5–7 days, light watering to settle soil
  • Months 1–2: Every 7–10 days
  • Months 3–6: Every 10–14 days
  • After Year 1: Every 2–3 weeks in summer; monthly or less in winter

Drip Irrigation

Place 1 emitter (1–2 GPH) 12–18 inches from the base. San Pedro appreciates more water than most columnar cacti, which helps it maintain its fast growth rate. However, always let the soil dry completely between waterings. Overwatering causes root rot.

How fast does San Pedro grow in Phoenix?
San Pedro is one of the fastest-growing columnar cacti, adding 1–2 feet per year in Phoenix with regular summer watering. A 5-gallon plant can reach 6–8 feet within 3–4 years.

Is San Pedro frost-hardy in Phoenix?
San Pedro handles most Phoenix winters well, tolerating temps down to about 25°F. During rare hard freezes, drape frost cloth over the plant. Established specimens are more cold-hardy than young ones.

Does San Pedro bloom?
Yes — mature San Pedro cacti produce large, spectacular white flowers that open at night during summer. The blooms are fragrant and typically last one night, attracting moths and bats. Plants usually begin blooming once they reach 4–6 feet tall.

How does San Pedro compare to Totem Pole Cactus?
Both are tall columnar cacti, but San Pedro has visible ribs and small spines, while Totem Pole (Pachycereus schottii ‘Monstrosus’) is smooth and spineless with a knobby texture. San Pedro grows faster and produces showy flowers. Both are excellent choices for Phoenix desert gardens.

You May Also Like

  • Totem Pole Cactus — a smooth, spineless columnar cactus with a unique sculptural form.
  • Mexican Fence Post — a tall, columnar cactus often used as a living fence in desert landscapes.
  • Golden Barrel Cactus — a round, golden-spined cactus that contrasts beautifully with tall columnar species.
  • Ocotillo — a spindly desert native with fiery red spring blooms, perfect for adding movement to cactus gardens.

How Many San Pedro Cactus Do I Need?

San Pedro works two ways: as a single sculptural specimen, or branched together into a fast-growing columnar screen. For a focal point, plant one and give it 5 to 6 feet of clear space so the multi-stemmed form can spread. For a living screen along a wall or property line, space the columns 3 to 4 feet apart:

Run length Plants at 3.5 ft spacing
10 ft 3 plants
20 ft 6 plants
30 ft 9 plants
40 ft 11 plants

For a grove effect, group 3 to 5 columns in odd numbers, each 3 to 4 feet apart, so the ribbed stems read as one bold cluster.

San Pedro Cactus Season-by-Season in Phoenix

  • Spring (Feb-Apr): Prime planting window. Warm soil drives fast root establishment and the first flush of new column growth.
  • Summer (May-Sep): Peak growth season, adding 1 to 2 feet with regular deep watering. Large fragrant white flowers open at night and draw moths and bats. Handles full reflected heat off walls and pavement.
  • Fall (Oct-Nov): Second-best planting window and continued growth before cooling. Taper watering as temperatures drop.
  • Winter (Dec-Jan): Evergreen blue-green structure holds all winter. Hardy to about 25°F: during a hard freeze, drape frost cloth over the columns, especially on young plants.

At a Glance

✔ Heat-Loving (Reflected-Heat Tolerant)   ✔ Drought-Tolerant   ✔ Pollinator-Friendly   ✔ Pool-Friendly (Low-Litter)   ✔ Evergreen   ✔ Low-Maintenance   ✔ Deer & Rabbit-Resistant   ✔ Cold-Hardy to 25°F

Plant It With

Is San Pedro Cactus Right for Your Yard?

San Pedro thrives in full sun to light shade with fast-draining soil, and it tolerates reflected heat off walls and pavement better than most columnar cacti. Give it room to branch and break through any caliche layer so water never pools at the roots. It is not a fit if your spot stays wet or shaded, or if you cannot cover it during a rare hard freeze while it is young.

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J
JeFF Stumpo
Fort Morgan, US
★★★★★ 5
A Feminist Divine Comedy?
Format: Paperback
Let me start with this: The Descent of Alette is difficult to read at first. Notley "puts quotation marks around" "groups of words" "in lines" "that can be off-putting." Note that I'm not quoting from the book there, just giving an example of what the book's text appears like. This forces us to read more slowly, taking in each line a few words at a time. What appears to be awkward is in fact a great solution to the speed-reading most of us do these days. That being said, it's troublesome for the first few poems, less so after that, virtually invisible by the end of the first section. When talking about this book, I immediately compare it to Dante's Divine Comedy, and I commonly see others do the same (see an earlier review here on Amazon.com). Exchange Hell for a subway, and you've basically got it: an underground realm ruled over by a Tyrant, poor souls being tortured, though in this case there is no indication that they have done anything to deserve it. Notley's language might not be quite as beautiful/harsh as Dante's, but her images stand with anything he created. After introducing two characters on a subway, a woman and her baby, both on fire, Notley writes: "another woman" "in uniform" "from above ground" "entered" "the train" "She was fireproof" "she wore gloves, & she" "took" "the baby" "took the baby" "away from the" "mother" "Extracted" "the burning baby" "From the fire" "they made together" "But the baby" "still burned" ("But not yours" "It didn't happen" "to you") "We don't know yet" "if it will" "stop burning," "said the uniformed" "woman" "The burning woman" "was crying" "she made a form" "in her mind" "an imaginary" "form" "to settle" "in her arms where" "the baby" "had been" "We saw her fiery arms" "cradle the air" "She cradled air" ("They take your children" "away" "if you"re on fire") "In the air that" "she cradled" "it seemed to us there" "floated" "a flower-like" "a red flower" "its petals" "curling flames" "She cradled" "seemed to cradle" "the burning flower of" "herself gone" "her life" ("She saw" "whatever she saw, but what we saw" "was that flower") After surviving the horrors of the subway, Alette goes even deeper underground, passing through a series of psychological challenges that at times seem straight out of Freud, at times out of Classical mythology, at times out of collective dreams. Throughout it all, we learn more and more about Alette, who is not just a "hero" who goes through the motions necessary to the plot, but who considers and stumbles and is confused and learns. The third section of the book is a rebirth, wherein Alette finds a source for a stronger power than the Tyrant's, and it is distinctly feminist in its nature. I need to note here for those who react to feminism in a knee-jerk way: Notley's feminism is not a militant feminism, though it requires brief "military" action on Alette's part. Men are helpful in the story, have purpose besides being the bad guy. If anything, what Notley attacks in the form of the Tyrant is the idea of a corrupt masculinity, a kind of Big Brother who would easily stand as an antagonist in any number of 20th/21st century literary works. Alette's feminism is the discovery of her place in the world, and that place is not slaving away mindlessly for the Tyrant, not acting as just a womb or pair of hands or pretty face. It's a nuanced message, despite the epic (and therefore presumably black-and-white) nature of the whole book. The fourth section is the showdown with the Tyrant, a great deal of philosophizing, and an ending that I actually find more satisfying than that of Paradiso. I won't spoil it here, but it just works extremely well in conjunction with the themes of Descent as a whole. If you want to be challenged, if you want to think deep thoughts, if you want surreality and magic, pick up The Descent of Alette. For even more interesting reading from the author and her partner, you could also turn to The Scarlet Cabinet, which contains but actually predates the on-its-own publication of Descent.
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Reviewed in the United States on October 11, 2010
K
Kent Shaw
New York, US
★★★★★ 5
A Contemporary Epic
Format: Paperback
I have a complicated relationship with most of the books I've read by Alice Notley. I admire her facility with the lyric, her ability to get just beneath a concept or sentiment using a very talk-y style so that I always feel like I'm with whatever speaker she's using, inside that mind and her mind all at once. This is a good kind of complication. It's one I yearn for with poems. The unpleasant complications are when I feel as though I'm just being subjected to her unedited notebook entries. Too much, too much, too much. It comes up especially with her book Mysteries of Small Houses. I mention these difficulties only to sharpen the accomplishment of The Descent of Alette. Like other reviewers, I feel the tonal similarities to Dante's Inferno. Which becomes a subversive allusion considering Alette seeks after a male Tyrant in order to destroy him, while Dante sought after his Beatrice out of desire. But I read and reread Alette, because Notley continually subverts patriarchal conventions in the book. I actually find I crave the speaker's intellect, and the mythic logic that gives the book its arc. I want it more. Yes, there are quotations around each fragment in the poems. I actually appreciate them for slowing my reading down, and for sharpening my focus on the use of Notley's language. And it's not just a stylistic tic, or something to be endured. It could actually be described as further subversion of The Tyrant Alette pursues.
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Reviewed in the United States on August 25, 2011
R
Verified Purchase
Raquel Wilbon
New York, US
★★★★★ 2
Imagery and diction
Format: Paperback
This book was very challenging to read because everything was written in quotations however, it was intriguing as a different way of writing poetry.
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Reviewed in the United States on August 11, 2020
A
Verified Purchase
amber a
New York, US
★★★★★ 5
I tend to leave most books in this genre disappointed. I miss the classics
Format: Hardcover
I bought this book after hearing Stacey Lee speak about narrative tension at a lecture for YA writers - the talk was specifically entitled, "How to keep them up all night." The lecture (alongside Anna Shinoda) bit off a rather large amount of material. Neither woman mentioned vampires. The methods they discussed were smart, creative, and delivered with just enough humor to leave me wondering whether I'd be able to put their debut novels down. I devoured GONE WITH THE WIND at least six times cover to cover between my sophomore and senior year. While I am more susceptible to the Historical Fiction page turner than the average girl, I tend to leave most books in this genre disappointed. I miss the classics. I opened this book determined to not judge it by its gorgeous pastel cover. I started slowly. I enjoyed the first four or five chapters - leaving each fully appreciative of Lee's craft. I particularly enjoyed her ability to pepper humor though tragedy. I often complain about writers who miss the mark here. Stacey Lee nailed that important believable balance for me. I liked her characters quickly. I left each chapter satisfied, but thoroughly able to get up and go on with my life. Like a jaded Thumper in Walt Disney's BAMBI, this book was more than nice, but I wasn't susceptible to any kind of teen-aged Twitterpation over it. After the sixth or seventh chapter - four or five days after I first picked it up, I quietly closed my copy, placed it on my nightstand, switched off my lamp, fluffed my pillow and turned over. I turned over again. I flipped on the light - OK, just one more chapter... I zombie sleepwalked to work the next day. That night I retired early, making some completely convincing excuse about being exhausted. I was certainly too tired to read. Flash forward to 6AM when I woke up with this novel on my face. I turned it's last page this afternoon, fully satisfied. I am truly sad it's over. This book transported me. It's one I'll want to have in my collection forever, alongside the beautiful books that mattered to me as a teen; JANE EYRE, TO KILL A MOCKINGBIRD, UNDER A PAINTED SKY. Classic in feel, subject matter, and voice - but modern in approach, I'd be as comfortable recommending it to my book club as I would handing it to any teen. Readers of all ages and walks of life will surely find something that resonates with their own stories too. As for me, I am sure I'll be back on the trail with these girls-- I mean boys, before long. Now I'm off to try my hand at Anna Shinoda's LEARNING NOT TO DROWN. Well, maybe tomorrow. I need a good night's sleep and it's clear these authors know how to keep those pages turning.
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Reviewed in the United States on August 24, 2015
R
Verified Purchase
Ruth Franklin
Draper, US
★★★★★ 4
Good, Fun, Important Topics
Format: Paperback
Good, solid, read for ages 12+. Somewhat unrealistic and yet believable story of two strong young female characters traveling west disguised as boys. Couldn't stop reading it until I was finished with the book, and now my granddaughter is doing the same. This book has many relevant themes about race, gender, class, religion, and other stereotypes and is an excellent choice for a classroom or family read aloud. Get it.
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Reviewed in the United States on February 26, 2017

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