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Now I live in the desert; very dry, very hot. Seems logical that you'd have to water the living crap out of everything virtually every day. Right? Wrong! The plants are different, the soil's different, it's a whole 'nother shooting match entirely. Cacti have attitude: 'Go ahead, dumb ass, water me once a week, see what happens.' What happens is they quickly become sullen and lethargic. Keep it up and it's, 'Up yours, sucker. I'm outta here.' Game over. Post mortem: homicide. Weapon: water. Perpetrator: me.
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Homicide victims are not noted for their photogenicity and cacti are no exception. Pix of the survivors are considerably more appealing. Here are 3 that have yet to succumb to my ministrations.
Golden Barrel Cactus
Echinocactus grusonii
Tubac Prickly Pear
Opuntia macrocentra/violacea
Century Plant
Agave americana