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Lithops are grown similarly to cactus, but not identically, there are some differences. Cactus come from a variety of climates, from tropical to temperate, but nearly all very dry and nearly all in the Americas. Lithops come from one fairly small part of southern Africa. I'm not at ALL an expert on cactus, I don't own any, just succulents, and cactus care requirements vary a lot across species, some are amazingly tolerant of water, or of cold, or even both, where Lithops are not tolerant of water at all, and are only tolerant of cold when kept absolutely bone dry.