Answer: Your plant may be suffering from a nutrient deficiency. If you have not fertilized your plant, try doing so with a dilute fertilizer solution. The plant may also need repotting; use a good quality potting soil -- or even a soilless seed-starting mix, though these mixes tend to dry out quickly. (Only repot if your plant has gone 2 or 3 years without repotting; if it is new this year, skip this step.) Christmas cacti also do not like the dry air found in the winter in most houses. Try standing the pot on a bed of moist gravel or sand to provide humidity. And keep away from drafty areas or heaters.
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