San Pedro Cactus (Echinopsis pachanoi) – PC vs. Non-PC Explained

The San Pedro cactus (Echinopsis pachanoi) is highly popular and often cultivated commercially. One particular lineage, commonly referred to as the “PC” (or “Predominant Cultivar”) clone, has become widespread in the United States. Below, we’ll answer some frequently asked questions about PC vs. non-PC San Pedro cacti.

1. What is the “PC” clone?

“PC” stands for “Predominant Cultivar.” It’s the most commonly distributed Echinopsis pachanoi in commercial nurseries across North America.
It is known for having relatively short, light-colored spines, noticeable “V-notches” above the areoles, and fairly uniform rib spacing.

2. Do you sell the PC clone?

Likely, yes. Given its prevalence, most of our Echinopsis pachanoi stock comes from well-established nursery lines, which are predominantly the PC clone.
We do not conduct genetic testing on individual cuttings, but our plants generally exhibit the hallmark features associated with PC.

3. What is “non-PC”?

“Non-PC” is a catch-all term that encompasses all other E. pachanoi strains and seed-grown varieties that don’t match the classic PC clone.
Non-PC plants can feature greater spine variations, different rib shapes, or unique areole placements and can be harder to find in standard garden centers.

4. How can I tell if my cactus is PC or non-PC?

Appearance Clues: Short spines, slight indentation or “V-notch” above the areoles, and generally uniform green color.
Growth Habits: PC tends to grow consistently in well-defined segments (though environment affects growth, too).
Source: If you purchased your cactus from a large-scale nursery or common horticultural supplier, it’s likely PC.

(Note: None of these indicators are 100% conclusive without genetic testing.)

5. Why does the distinction matter?

For most casual growers, the PC vs. non-PC question is purely for curiosity. Both forms are Echinopsis pachanoi and share similar care requirements.
Collectors often enjoy seeking out unique or rarer non-PC strains for their distinct appearance or lineage.

Conclusion

Regardless of whether your San Pedro is PC or non-PC, the essential care is the same: plenty of sunlight, well-draining soil, moderate watering, and protection from extreme cold. If you have further questions or want to learn more about caring for your cactus, feel free to contact us directly!