How can I propagate a Christmas cactus?

FAQ
Question: 

How can I propagate a Christmas cactus?

Answer: 

Christmas cacti are easy to propagate.  Remove sections of the plant consisting of 2 to 5 flattened stem segments.  Cut or pinch off each section at a joint.  Allow the cut/pinched ends of the cuttings to callus overnight.  The following day, fill a pot or other container with perlite or coarse sand.  Water the rooting medium and let it drain for a few minutes.  Insert the cut/pinched end of each section about 1 inch deep into the perlite or coarse sand.  Firm the perlite or coarse sand around the sections to keep them upright.  After all the cuttings are inserted, water the rooting medium again.  Allow the perlite or sand to drain for a few minutes and then set the container in a brightly lit location.  Periodically examine the cuttings over the next several weeks and water the rooting medium when it begins to dry out.  The cuttings should root in about 6 to 8 weeks.  When the roots are one inch or longer, plant the cuttings in a pot using a well-drained potting mix.

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