This year all my zygocactus rotted at the base. I took the stems that
fell from the plants and these are beginning to root. I know that
these plants will rot if left wet, and although I had all of them in
clay pots (no saucers) resting on sticks for quick drainage the
plants' roots rotted. They were put on my deck with brief morning
sun. How often should these plants be watered in summer? Is
cactus/succulent mix the best potting soil? Should I drill additional
holes in the clay pots?