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I'm dusting off my Pereskiopsis, so to speak, and I'm curious about soil mix. I know peres loves wet organic soil and loves 'grow' style fertilizer and I've heard sporadic rumors that supplementary calcium and magnesium is helpful. This seems logical given the rate of growth. I've never grown peres in a basic medium, would it help or impede growth if I mixed a notable quantity of shell into the soil mix? I can also quite easily make a liquid calcium-magnesium concentrate to add to the water, its just that when I hiked out to get a load of mineral rich sand for cacti today I also picked up a lot of 1-2 cm freshwater clam shells and I can get as much of those as I can tolerate hauling the 4 kilometers back home So, basically, has anyone added lime or shell to perskiopsis soil?