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Mushrooms, Mycology and Psychedelics > The Ethnobotanical Garden
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San pedro identification!
    #21105511 -

Hey guys, so this is my first time posting in here,

I've been trying to read through a few other similar posts but am still confused about a few things so thought I'd make my own and ask you lovely humans :smile:
First off, I'd like to admit that I am a complete N00b! So please be kind enough! I'm not sure if I'll get all the terminology right and definitely don't know all the scientific names yet :/

My friend just moved into a house that has an absolutely Huuge cactus growing in the back yard. It grows about 4 meters tall and probably the same distance wide. I think it's a few plants bunched together.

It's made up of the long vertical columns which branch off into more vertical arms. On average the columns are about 15cm thick. (half a foot)
In terms of spikes it has little white ones about 3mm long spaced about an inch apart along the vertical ridges.
The vertical ridges themselves are thicker/wider than they are protruding. By the looks of it they have six or seven points.

The color is dark green. It's just started flowering and the flowers are white with lots of thin, long petals and protrude horizontally about 15cm from the arms.

To condense the description into questions:
1.I've read that the main SP has no spikes. Do any of the spiky varieties still contain any mescaline? or very much?

2.I keep reading differing info about how many points/corners the cross-section star should have.. One guy says 5 another girl says 6 and another guy says 7. So what's the go? And they all were happy to make a tea out of them in their youtube vids.

3. Are there any deadly varieties that look similar to SP?

Thanks in advance anyone for any info, sorry about no photo, I'll get one up as soon as I get back to my friends place! I know the description is a bit dodge!

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Re: San pedro identification! [Re: littlechief]
    #21105543 -

Welcome, littlechief:sunny:

SP does have spines. In some lines, they may not be very prominent, whilst others will have strong centrals. Also growing conditions will affect spine density.
Rib count will also be affected by the growing conditions and genetics. They can gain or drop ribs within the same column, it isn't fixed.


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Re: San pedro identification! [Re: Mostly_Harmless]
    #21107903 -

Easier if you can post a photo of the plant, and close up showing the needles and ribs

San Pedro is a pretty common cactus used in landscaping


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Re: San pedro identification! [Re: HarryL]
    #21111744 -

HarryL said:
Easier if you can post a photo of the plant, and close up showing the needles and ribs

San Pedro is a pretty common cactus used in landscaping


There are lots of species used as landscaping as well.

If you are talking USA predominant cultivar compared to others, there are shitloads of different san pedro plants as t. pachanoi. Seems it's easy to ID picture of PC pachanoi pretty easy, if someone want to avoid it, but there are lots of different pachanoi forms around.

Around the world there are no predominant cultivars much, just random pachanois. Area where plant grows will effect the appearance as well as amount of sunlight may increase spine growth, sometimes you'll find san pedro have bigger spines at side where sun shines most. Not all genetics do that along t. pachanoi but few have very variable spination, depend on growing habitat.

IMO PC and other t. pachanoi isn't same thing so far. Both is just called By the name San Pedro. "real san pedro" from it's habitat is pretty different and variable cactus.


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Edited by intelligentlife (01/15/15 03:49 AM)

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Re: San pedro identification! [Re: intelligentlife]
    #21121179 -

Hey guys, thanks for all this info

I'm going there this arvo so will get a picture then :smile: Yay how exciting!

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Re: San pedro identification! [Re: Mostly_Harmless]
    #21121204 -

It's interesting to know the number of ribs isn't fixed, cause all the youtube vids they seem to get pretty excited about counting how many there are. I thought it meant that the number of ribs was very important.

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Re: San pedro identification! [Re: littlechief]
    #21123148 -

I have heard one poison story, but the actual beverage wasn't even what is should have been. Wrong ID at forum and beverage were too dark. So far no one have reported toxic effects except that one guy ingested wrong cactus due to wrong ID.. except t. tercheckii @ erowid, where said persons felt poisonous and mescaline after ingesting t. tercheckii beverage, only one story, t. tercheckii is easy to separate from t. pachanoi/bridgesii if you are after mescaline.

That plant someone were ingested was "someway" similar to trichoereus, anyway it had very sharp ribs and different appearance than san pedro cactus. If you trying to compare picture from google to plant in your hand, you get confused. First of all, if you have big adult cactus branch, you should not compare it look to seedling plants or so.

In general san pedro is easy to feel when seeing it(and smell&taste a bit fresh cut if possible)

What comes to actual ID for OP, picture would help much.:thumbup:

littlechief said:
It's interesting to know the number of ribs isn't fixed, cause all the youtube vids they seem to get pretty excited about counting how many there are. I thought it meant that the number of ribs was very important.


Amount of ribs doesn't really tell much.. Ribs can be count like "4-6 ribs" or "5-10 ribs" depends what plant you are talking about.

In general most san pedro goes to 6 ribbed, sometimes 5 and then back to six and so on.. In full sun they may reach 8 ribs. Bridgesii will usually have lower amout of ribs compared to actual san pedro cactus tho

So far, I am not sure is this true, but seems amount of ribs is there because plants needs shade it's skin, more ribs = more surface to get shade. Their habitat vertical ribs is good because sun rises almost directly from east and set to west anyway but not totally 90degree angle.

It seems plant just increase ribs when it needs more shade because of strong light, sometimes ribs increase because of aging, with lophophora aging cause rib count increasing and so on.

So far trichocereus seems decreasing ribs when light levels get low and increasing it when light levels goes up. I have seen many san pedro with "rib play" where cuttings may have radomly some 6-7 ribs. Sometimes increasing, sometimes decreasing.

I just last year cut one 5 rib slim san pedro to cutting, it was from southern america, it turned out to be 6 ribbed plant when new offshoot grew.

Someone may correct but so far accurate rib count doesn't tell anything, except the fact some 9-10rib pachanoi may have been exposed to strong sun over few years and may have lots of ribs, especially if sunshine is hot and baking. This way the area of shade at skin increases, anotherway in poor light area of skin to get light increase when rib count drops.

Sometimes there seems to be in genetics for example 6 ribs is "common" and usual at one clone, but it may change, depends on location. Sometimes it's not matter of light, but most likely it seems so. My climate causes all pachanoi/peruvianus/bridgesii dropping ribs down to 5-6 from 6-8, in general, some trichs have 7 ribs.

I am at climate what is 100% hostile for cacti, so far what I've find out is light causing the ribs increase/decrease. Plant needs shade to it's skin from it's own ribs to prevent exceess water evaporation over the hot sunny day. Also when sun moves above sky, another side of plant starts to receive the light and so on, as well as another side of ribs will do when sun moves.

Edited by intelligentlife (01/15/15 03:52 AM)

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Re: San pedro identification! [Re: littlechief]
    #21123579 -

By popular belief and folklore it was said that rib count could be sign of potency , like 8 ribs are weak and 6 ribs is potent, 7 ribs is the weakest
Is i recall right i heard that 4 ribs is considered the most potent because the 4 cardinals N S W O.
Anyhow, that's just folklore,supersticion.
but i have to say that low rib count is rarer, i wish i had a 4 rib Trich
i have a beautiful 5 Rib Bridgesii though


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                                                        "The best things in life, come covered in spines."

Edited by Lemnaminor (01/15/15 02:49 AM)

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Mushrooms, Mycology and Psychedelics > The Ethnobotanical Garden
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