Fill a small growing container with one part potting soil and one part fine-grade fir bark. Plant the Thanksgiving cactus at the same level it was previously growing. Add just enough water to moisten the soil and place the container in a location that receives bright, indirect sunlight.
Water whenever the top inch of soil feels dry until the plant begins to show signs of growth. Once this occurs water only when the soil feels completely dry.
Move the plant to a very dark location, such as a closet, for 12 to 14 hours each day beginning in middle September. This is necessary for the development of flower buds. Alternately, you can cover the cactus with a large paper bag. The chosen location should maintain a temperature of approximately 50 degrees F.
Remove the Thanksgiving cactus from the dark location once flower buds begin to develop. Begin to fertilize the plant once every two weeks with balanced liquid fertilizer mixed at half the strength recommended on the package. Stop fertilizing for one month after the blooms have faded.
Transplant the Thanksgiving cactus plant to a larger pot every other year.