Pacific Cactus TBM A x TPM

"Pacific Cactus TBM A x TPM" refers to a specific hybrid cross of Trichocereus cacti.

Let's break down what each part means:

Pacific Cactus:
This likely refers to a specific nursery or grower that made the cross and sells the resulting plants or seeds. Many specialized cactus growers name their crosses to identify their origin.Expected Characteristics of the Hybrid:
When these two highly variable monstrose forms are crossed, the resulting seedlings (F1 generation) can exhibit a wide range of characteristics. You might see:
Unique Monstrose Forms:

The offspring will likely display novel combinations of the irregular, bumpy, and sometimes elongated growth patterns from both parents.

Variability: Due to the inherent genetic instability of monstrose forms and the cross between two distinct ones, there will be significant variation among seedlings. Some might lean more towards the TBM A look, others towards TPM, and many will be unique blends.

Potential for Cresting: Given that TPM is known to crest, there's a possibility that some of the hybrid seedlings could also develop crested growth.

Growth Habit: They will likely be vigorous growers, as both T. bridgesii and T. pachanoi are known for relatively fast growth, even in their monstrose forms.

Collector's Item: Such a cross is highly sought after by cactus collectors who appreciate unusual and mutated forms. Each seedling can be a unique specimen.

In summary, "Pacific Cactus TBM A x TPM" refers to a fascinating hybrid that marries the distinct "long form" monstrose mutation of Trichocereus bridgesii with the irregular and often unpredictable monstrose growth of Trichocereus pachanoi, promising a diverse array of unique and captivating cactus forms.