Click below to listen to my Garden Bite radio show: Propagating holiday cacti
To propagate a holiday cactus wait till your plant has stopped blooming. Prune your cactus to encourage branching out and, while you’re at it, remove a few sections or segments by pinching your your fingers.
Using a 4 inch pot with a soil-less mix, place your segment into the mix no deeper than half way up the first segment. Your piece should be about 3 or 4 segments in length. To speed up the rooting process, place the whole pot in a gallon ziplock bag, sealing in ALMOST shut to increase humidity. Place in a sunny window and keep moist NOT wet. You do NOT have to put it in a ziplock bag, only if you want to speed up the process.
Once you see growth on the tips of the lobes (this will probably look reddish in color) take your plant out of the bag. You can transplant it into another pot with a light soil mix, adding compost. Give it a 20-10-20 fertilizer every other watering.
If you’re lobes are flabby, you’ve overwatered. If your lobes look wrinkled, you’ve under watered.
More on Holiday cactus from the University of Minnesota Extension