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The Getty Museum in Los Angeles has a roof top filled with cacti. A field of Agave, Barrel cactus and, yes, San Pedro! No access is granted to the public so you may view it from the visitor area. Image...
San Pedro cactus are technically known as Trichocereus Pachanoi�a readily recognized variety whereas other Peruvian cactus are harder to name. Trichocereus Bridgesii has definite features such as long spines and blue skin color. But Trichocereus Peruvianus is sometimes called Peruvian Torch�yet there is wide variation in these cacti. Peruvianus may vary from green to blue, from short spines to long ones. The key difference from San Pedro is that Peruvianus are fatter, bluer, longer spined and grow more vigorously than San Pedro�which is saying something since San Pedro is a rapid growing species!

The real Peruvian torch is blue. There are so few of these available for sale in the United States that some dealers are selling Trichocereus Cuzcoensis as "San Pedro Macho" and calling it "Peruvianus".
Rooting columns with branches
Mature sections with tips are tricky to root. Tips are easier and faster, but creating a mature plant from a column is worth the effort. Here are a few suggestions to help you be successful.
Container grown San Pedro
If you grow San Pedro in containers you can move them into a house or garage to protect them during the winter. But container grown plants need fresh soil; here is how I mulch mine with fresh compost.
Tip Comparison
Not all San Pedro look the same, but before you conclude that these are different varieties consider growing conditions.

1) The bluish tip at left was grown in a shady location. The yellow colored one in full sun. If you want taller/thinner/bluer San Pedro grow them under a tree.

2) The 9 ribbed specimen simply means the column is older, more mature. As the plants age I have seen them transition to more ribs. The 7 ribbed tip is from a younger column.

If you root these two specimens you can grow identical plants by giving them identical growing conditions; all their new buds (tips) will look the same.

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