@DailyPlantBot Looks like a Fairy Castle Cactus to me, Acanthocereus tetragonus

— Ben Stover (@cactusgasm) 2021.8.25

basically every windowsill in my house roll call: pilea, ficus lyrata (fiddle leaf fig), monstera deliciosa, novice phalaenopsis orchid, and acanthocereus tetragonus (fairy castle cactus) https://t.co/fnjbFrZe0b

— ✪ seanzen ✪ (@seanfranzen) 2021.6.24

@100talkpod The small one with the flowers is a spiny pincushion cactus idk it's botanical name and the other one is a Fairy Castle Cactus (Acanthocereus tetragonus).

— Shaaranya (@DrPubz) 2021.4.5

5 years later.. Acanthocereus tetragonus “fairy castle”. #cactus https://t.co/xV2K4h9M45

— Mimi H. (@mir_u00) 2020.10.8

Rutile as the fairy castle cactus (Acanthocereus tetragonus)! (this is also my cactus!) https://t.co/2NNZChc5Sf

— Nikolai (xiao long bao) (@dimasiiilaw) 2020.10.9

inktober 2019, day 2 - Acanthocereus tetragonus ‘fairy castle’ monster design https://t.co/O3Eca1Wbz8

— ❕human barometer (@hotmesslevi) 2019.10.3

Acanthocereus Tetragonus (Fairy Castle Cactus) is a dwarf, columnar, branching, slow growing cactus with spiny, five-sided, mid-green stems producing numerous smaller offsets. It will reach about 6 feet tall with great age. Nocturnal, white or yellow flowers are rarely produced. https://t.co/e9kgZhvG73

— Lil cactus (@Lilcactus4) 2018.11.24

Valeska. Acanthocereus tetragonus variegated fairy castle. Nombrecito!! http://t.co/3d0AjjzZu7

— teti (@ECergneux) 2014.10.28