PlantsAcanthocereus→Triangle Cactus (Acanthocereus tetragonus)

Common names:
Give a thumbs up Triangle Cactus
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Give a thumbs up Pitaya Morada

Botanical names:
Acanthocereus tetragonus Accepted
Cereus validus Synonym
Acanthocereus colombianus Synonym
Acanthocereus baxaniensis Synonym
Acanthocereus occidentalis Synonym
Acanthocereus horridus Synonym
Acanthocereus subinermis Synonym

General Plant Information (Edit)
Plant Habit: Cactus/Succulent
Sun Requirements: Partial or Dappled Shade
Minimum cold hardiness: Zone 9a -6.7 °C (20 °F) to -3.9 °C (25 °F)
Fruit: Showy
Edible to birds
Other: Red when ripe
Flowers: Showy
Flower Color: White
Bloom Size: 5"-6"
Flower Time: Summer
Suitable Locations: Xeriscapic
Edible Parts: Fruit
Wildlife Attractant: Butterflies
Resistances: Drought tolerant
Containers: Needs excellent drainage in pots
Miscellaneous: With thorns/spines/prickles/teeth


Photo gallery:

Posted by Baja_Costero (Baja California - Zone 11b) on Aug 29, 2019 10:20 PM

Shrubby, arching or climbing cactus with 3-5 ribs and stout spines. Flowers are large, white and nocturnal. Fruit is red or green, spiny or not.

Widespread and common in coastal areas and on hills through the tropics of North and South America, including southern Florida and parts of the Caribbean, from 26°N to 2°N. Highly variable.

The name of this genus means "spiny cereus". It was condensed to 1 species (tetragonus) in the early 2000s but appears to have recently expanded to include a number of resurrected former Acanthocereus species (each restricted to a certain geographical area) and a subgenus of Peniocereus (about a dozen plants) which was shown by DNA studies to fall alongside Acanthocereus and separate from the other subgenera of Peniocereus.

This species absorbed Cereus validus in the recent past, but that plant was subsequently removed by Lodé, so C. validus stands as its own distinct species again. Our database does not reflect this change because it follows the Catalogue of Life.

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Discussion Threads about this plant
Thread Title Last Reply Replies
Repotting Fairy Cactus Again by SerenityDream Apr 29, 2021 6:03 PM 3
How much water for a repotted fairy castle cactus by SerenityDream Apr 30, 2021 10:24 AM 5
What do we have here? by riverofwind Mar 19, 2021 2:00 PM 3
My cactus looks like she is dying by Jaidepoulsen Dec 30, 2020 4:23 PM 2
Please help identify by Adammoore2011 Nov 13, 2020 1:11 PM 5
Cacti color change and physical damage by PlantPashionista Mar 21, 2020 10:41 AM 5
The COVID_19 Picture Diversion thread by mcvansoest May 17, 2021 10:41 PM 2,010
Bent/Stretching Cacti by _mel Oct 5, 2019 7:12 AM 16
Monstrose, Cristata, Crested, and other fun mutations by Esperanza Mar 2, 2020 9:38 PM 35
How to get cactus to bloom? by Philipwonel May 24, 2018 5:43 PM 81

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