Sclerocactus mesae-verdae grows very slow on their on roots. FH061.8 from New Mexico (Many Devils Wash)
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Kept dry, this species can withstand -15 degrees Celsius and maybe even lower. Water early spring (1st weekend of March). This one is grafted on a very hardy Opuntia fragilis hybrid (better not to touch). The grafting stock requires some water in summer. Stop watering at the middle of September.