There are all kinds of Trichocereus hybrids out there and I am happy to show you a couple of the resulting crosses on this page. I will try to update this page as often as I can, to show you what others grew from a certain cross.
Now let me add a little bit of background info to give you an understanding how this breeding works in case you are completely new to this. Almost all Trichocereus species are self-sterile. That means that you need pollen from another plant to produce seed. The pollen donor needs to be genetically different from the receiver. Because of that, it´s not possible to cross two different cuttings from the same mother plant. If you list the parents of a cross, it looks something like this:
Trichocereus peruvianus x Trichocereus bridgesii
That simply means that the Peruvianus is the mother plant, while Trichocereus bridgesii is the Father. In most cases, the resulting offspring comes closer to the mother than to the father. However, there are a lot of exceptions to this and sometimes, the genes of the father are simply more dominant.
You can cross a whole lot of Trichos with each other and most of the crosses will work, if you did it right. But there are some crosses that just genetically don´t match. For example, the seedlings produced by that cross end up being variegated/albinos or simply die. That´s actually very common and can happen all the time. It happens the most when crossing plants like Hildewintera hybrids. And that´s probably because there werent many plants in the gene pool to begin with.
Most Trichocereus species have a white flower and apart from the extremely rare Trichocereus tulhuayacensis, all San Pedros are flowering white. Because of that, this community is trying to breed some San Pedros with colored flowers. There already are a handful of hybrids involving Echinopsis pachanoi with colored flowers. One such Trichocereus hybrid is called SAARWELLEN and the other one is AMUN-RE. But both Trichocereus hybrids are extremely rare.
Now, have a look at some of the photos of Trichocereus hybrids
Trichocereus validus Hybrid
Trichocereus terscheckii x Trichocereus bridgesii ‘Psycho0’
Echinopsis terscheckii x Echinopsis pachanoi
Trichocereus bridgesii ‘SS02’ x ‘Tom Juul´s Giant’
SS02 x Trichocereus bridgesii
Echinopsis peruviana ‘Sausage Plant’ x Trichocereus scopulicola
Echinopsis peruviana ‘ROSEI 1’ x OPEN
Pachanoi x SS02
Echinopsis pachanoi x J3
Echinopsis scopulicola ‘Super Pedro’ x J3
Trichocereus scopulicola ‘Super Pedro’ x Trichocereus bridgesii ‘HB02’
Fields x Rosei #1
Trichocereus bridgesii ‘SS02’ x Sierra Canyon
Trichocereus bridgesii SS02 x Trichocereus chiloensis
Psycho0 x Scopulicola
Luther Burbank x SS02
Sierra Blue x SS02
Echinopsis macrogona x Echinopsis scopulicola
Psycho0 x J2
Psycho0 x Open ‘Vishnu’