Ogun
$100.00
Species
Pachanoi
This is the page for the plants the trade calls San Pedro, and it sets out the identification cues our sources record under the name — no more than that.
73 names in the library6 in the yard1 for sale now
What to look at
- Ribs
- Six to eight is the usual count, occasionally as few as four or as many as nine, and they are broad and low rather than sharp. The count also moves within one clone: a grower shows six, seven and eight ribs on neighbouring plants of the same commercial stock, and rejects it as a way of telling plants apart.Reported, but not confirmed.
- Areoles
- Roughly one and a half to two and a half centimetres apart, each one a pad of white felt.Too little stands behind this for us to confirm it.
- Spines
- Short, and there are not many of them.Too little stands behind this for us to confirm it.
- Skin
- Mid to dark green with a matte finish, and no powdery bloom over it.Too little stands behind this for us to confirm it.
- Habit
- Fast, erect, branching from the base rather than staying a single column, and reaching about six metres in habitat.Too little stands behind this for us to confirm it.
- Girth
- A mature section commonly runs about thirteen centimetres — five inches — across.Reported, but not confirmed.
The tell
The chin. A small V-shaped notch sits in the rib just above each areole, and growers read it as a pair of wings that should point at the sky — which is how they work out which way up a cutting goes.Too little stands behind this for us to confirm it.
Mistaken for
Peruvianus, and often by the pachanoi's own doing: grown hard, in strong sun or on short water, it answers with longer spines and a heavier bloom, and those are most of what people are looking at when they call a plant peruvianus.Too little stands behind this for us to confirm it.
Every feature on this page moves with age, sun and water: a thirsty plant in hard light grows longer spines and a heavier bloom than the same clone in the shade. None of it settles an identity on its own, a clone name is not proof of a species, and a photograph is a pointer rather than an answer.
Worth knowing
Much of the cheap San Pedro sold through big-box stores is one widely propagated commercial cultivar rather than a seed-grown plant. Every plant of it is a branch of one original clone, so a shelf of them is one plant many times over.Reported, but not confirmed.
On the shelf now
Growing here
The mother plants this yard cuts from, in this group.
Names in the library
Every one of these carries a seal drawn from what a source actually recorded about it — the ribs, the spines, the growth form. A plain ring means nobody has written that one down yet.
The others
Sources
How this hub was written
Nothing here is copied. Every page was written from a fact list I built by reading, watching and cross-checking the sources below, with each fact tagged to where it came from. I keep that fact-by-fact record on my side of the counter; what you read here is what held up after checking it against my own plants.
The community wiki, written by many growers and published under a Creative Commons BY-NC 4.0 licence. We use its facts and reproduce none of its text or pictures.
@sanpedromastery6262 on YouTube
A hobby grower filming the same collection through two very different climates, which is where a lot of our seasonal numbers come from.
A one-person nursery in San Diego County filming its own practice in the open, in a climate close to this one.
Where growers argue things out in public. Useful for what actually goes wrong, and for seeing where opinion is split.
A Southern California nursery whose buyer guides and posted policies are the clearest record I found of what a cutting in the post should be like. They are also a competitor, and I read them as one.
And checked against
Growers know things nobody has written down, and those five are where that knowledge lives. But anything that can be checked against somebody who publishes under their own name and answers for it has been.
University of Arizona Cooperative Extension
A land-grant university's extension service, on sunburn and acclimation, freeze damage, planting depth, drainage, over-watering, rot and pests. Where this site and a forum disagree about water, this is the tiebreaker.
The Royal Horticultural Society
A national horticultural society's own growing guide: the watering year, the cool dry winter rest, mixes, pot size and how long a cut takes to callus.
A botanical garden's pest advice, written for cacti and succulents specifically — what mealybugs, scale, spider mites and root mealybugs look like, and what actually shifts them.
The International Plant Names Index
Kept jointly by Kew, the Harvard University Herbaria and the Australian National Herbarium. It is where the species names on this site were checked against the record of what has actually been published, and by whom.
Haseltonia, the yearbook of the Cactus and Succulent Society of America
Peer-reviewed taxonomy. The argument about macrogonus, pachanoi and peruvianus is settled in papers like this one, not in a comment thread, and this is the paper that made the change.
Nine more sit behind these pages the same way — extension horticulture from Illinois, South Carolina and two California counties, the Caryophyllales Network, the Desert Botanical Garden, a society’s grafting article and a journal paper on the family tree. Every one of them, and how much of this site rests on each, is on the sources page.
Every photograph on this site is of a plant grown in this yard — nobody else’s. The teaching pictures are drawings rather than photographs: a drawing can label the one thing it is teaching, hold two plants in the same light, and leave out everything that would only distract. And I will not tell you what your cactus is from a photograph: light, age and water change every feature people identify these plants by, so a photo is a hint and never a verdict.
Written from scratch off a cited fact list, never copied. Learned from the sanpedrocact.us community wiki (CC BY-NC 4.0), @sanpedromastery6262 and @IMDAVESBUD on YouTube, r/sanpedrocactus and medicactus.com's buyer guides, then checked against university extension horticulture, botanical gardens, cactus and succulent societies and the published botanical record. I will not name a plant from a photograph.
Every source behind this site →