When caring for a pink poinsettia after Christmas, keeping the plant well-watered and in a cool, bright spot is important. You should avoid overwatering your pink poinsettia, as this can cause the leaves to droop or turn yellow. Additionally, you may need to move your pink poinsettia to a slightly cooler location during winter, as pink poinsettias prefer to be kept at temperatures between 65-70 degrees Fahrenheit. Finally, you can compost your pink poinsettia once it loses its leaves and flowers, making it easy to dispose of the plant sustainably.