On Aug 1, 2:34 pm, Phisherman wrote:
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?

For cactus/succulent, you should water them when their soild is dry.
You can test it by puting chopstick into the pot. If the soil is wet,
there should be some soil going along with the chopstick.

Actually, the clay pot has only one pot and that is enough. Maybe the
soild mix causes trouble. You may change soil remix and mix more
sand. Sometimes, I use the top soil mixing with sand, small stones,
some fertilizer and dry leaves.

Fact and Information about cactus & succulent and another plant :
http://cactuslover.blogspot.com