TBM is shorthand for Trichocereus bridgesii monstrose. It is best treated as a group of named monstrose forms rather than one simple plant name.
The common clone labels A and B are useful, but they are also a source of mix-ups. Clone C is used more loosely in community/seller language and needs more careful documentation before Cactocereus treats it as a firm profile.
Names and synonyms
- TBM – common abbreviation.
- Trichocereus bridgesii Monstrose – descriptive name.
- TBM-A / Clone A – longer, more columnar/branching form in common usage.
- TBM-B / Clone B – short segmented form in common usage.
- TBM-C / Clone C – used in the community, but less consistently documented.
- Echinopsis lageniformis monstrose – older/broader taxonomic wording.
Classification
Monstrose Trichocereus bridgesii clone group. It should not be confused with TPM, which is usually used for pachanoi or peruvianus monstrose material.
Provenance notes
Trichocereus.net describes TBM as short for Trichocereus bridgesii monstrosa and discusses Clone A and Clone B as distinct common forms.
Clone A and Clone B are widely repeated in nursery/community use, but the exact source chain of a specific plant should still come from supplier labels or Cactocereus stock records.
Cactocereus has sold TBM Clone A/TBMA and TBM Clone B material. Keep those labels explicit because customers often search them separately.
Visual traits
TBM Clone A in Cactocereus images shows elongated, irregular monstrose bridgesii growth with reduced ribs and occasional spination.
Clone B is commonly understood as the shorter segmented form. Do not use Clone A photos to represent Clone B without a clear caption.
Growth and cultivation notes
Grow bright and dry-leaning with excellent drainage. Monstrose growth can mark, scar or terminate in odd ways, which is part of the form rather than always a problem.
Overwatering and cold wet compost are the usual UK risks. Rooted pieces should be allowed to dry properly between waterings.
Stock formats and Cactocereus notes
Cactocereus stock history includes TBMA cuts, TBM Clone B listings and TBMA hybrid seedlings. This profile should become the hub for those listings and comparisons.
Current availability
If this clone, species, or seed line is available, link the most relevant product or category here. If not, link the closest live category.
Source notes
Last reviewed: 2026-06-17. This profile is part of the Cactocereus library build-out and will be refined as better provenance notes, photos and grower observations become available.