‘MGB3’ – Trichocereus bridgesii Semi Monstrose – Cuts

Overview

Trichocereus bridgesii ‘MGB3’ is an uncommon clone selected for its unusual semi-monstrose growth.

Rather than forming the consistently straight ribs expected from a typical Trichocereus bridgesii, MGB3 develops swollen rib sections, irregular constrictions, displaced areoles and elongated raised sections that almost appear to melt into one another. The growing tip can become particularly distorted, producing chunky, rounded rib ends and an almost sculpted appearance.

It is not a fully monstrose clone in the same sense as TBM. Instead, it sits somewhere between normal columnar bridgesii growth and full monstrose expression, which is arguably part of its appeal. Enough normal structure remains for the bridgesii character to be obvious, while the mutation continually interferes with how that structure develops.

Colour is a soft blue-green to glaucous green, particularly on established growth, contrasting nicely with yellow to golden spines that darken towards their tips.

Clone History & Provenance

The plant has been circulated under the clone name ‘MGB3’, although its original history appears poorly documented.

One possible interpretation of the abbreviation is “Magic Garden Bridgesii #3”, potentially referring to a numbered selection originating from Magic Garden material. I have not been able to independently verify this provenance, however, so the clone is being retained under the established MGB3 name rather than presenting an uncertain expansion as fact.

As with quite a few older Trichocereus clones, sometimes the plant survives rather better than the paperwork.

What Makes MGB3 Interesting

MGB3 isn’t simply a wonky bridgesii.

The unusual growth appears throughout the cutting, with repeated morphological distortion rather than a single damaged or malformed section. Some ribs remain relatively conventional before suddenly swelling, narrowing or reorganising further up the stem.

The tip is especially characteristic, with chunky rounded rib ends and compressed growth creating a distinctly monstrose appearance.

As the plant continues growing, the balance between normal and mutated growth can change, so future sections may become more distorted, temporarily straighten out, or produce pups with differing levels of expression.

That unpredictability is part of growing clones like this.

What to Expect

• Growth rate: Moderate to fast once properly rooted and established. Rooting powder has been applied to speed up the rooting process.
• Mature form: Predominantly columnar but with recurring semi-monstrose distortion
• Colour: Green to blue-green, with stronger glaucous colour possible under suitable conditions
• Spines: Medium to long, predominantly yellow/golden with darker tips
• Mutation: Semi-monstrose expression can vary as the plant grows
• Difficulty: Straightforward for anyone comfortable growing Trichocereus

Grower Notes

Treat MGB3 much like a normal Trichocereus bridgesii.

Allow the cutting to remain completely dry while establishing roots, then introduce watering gradually once rooting has begun. A free-draining mineral-rich cactus substrate and good airflow are particularly useful in UK greenhouse conditions.

Once established it can be grown quite hard during the warmer months, with strong light helping maintain compact growth and good spine development.

As with other monstrose and semi-monstrose Trichocereus, the exact expression of the mutation is not guaranteed to remain identical throughout the plant’s life. Sections may become more distorted or temporarily produce more conventional growth before changing again.

Why This One Stands Out

• Established MGB3 clone
• Clear semi-monstrose / melting bridgesii growth
• Beautiful blue-green epidermis
• Strong yellow and golden spine contrast
• Mutation expressed repeatedly along the stem
• Particularly chunky distorted growing tip
• Uncommon clone with limited documented circulation
• Exact specimen shown is the cutting you will receive

Important Notes

The historical meaning of MGB3 remains uncertain. “Magic Garden Bridgesii #3” has been suggested as a possible origin for the name, but this has not been independently verified and should therefore be treated as collector lore rather than established provenance.

Morphological expression may also change with age and growing conditions. With freaks like this, variation is very much part of the point.

Origin and Habitat

Trichocereus bridgesii, also known as Echinopsis lageniforms hails mainly out of the Bolivian mountains but grows pretty much throughout Bolivia (Tarija, Santa Cruz, Chochabamba, LA PAZ, & Chuquisaca). Trichocereus bridgesii has been renamed to Echinopsis lageniformis by Friedrich and Rowley during their 1974 merger of the genus Echinopsis. The name Echinopsis bridgesii was already taken by a clumping Echinopsis species from Bolivia, which is a totally different plant and should not be confused with Trichocereus bridgesii.

UK Growing

In the UK, Bridgesii’s are quite popular due to their hardiness and can handle our low temp during winter (around 5C before bringing inside, although, adults can go lower). Flowers produce after around 10 years of growth, so, patience is required. Bridgesii differ in terms of humidity requirements, they do not tolerate high humidity very well and can form rot if left in high humidity for long periods. All our cacti are shipped bare root to protect the cacti, please ensure you have suitable substrate and a pot for your new dude. If you are stuck for what to use as a substrate, we have a very handy guide here. As always, please do not hesitate to get in touch, I will help you with any questions you might have. We have a trichocereus care sheet which you can reference.

Synonyms

• Trichocereus bridgesii Monstrose
• Bolivian Torch Monstrose
• Trichocereus boliviensis Monstrose
• Echinopsis lageniformis Monstrose
• Cereus lageniformis Monstrose
• Cereus bridgesii Monstrose
• Cereus bridgesii var. longispinus Monstrose