Christmas cacti are known for their festive flowers, which bloom in shades of red, pink, or white during the winter holidays. However, when the cactus is not given the proper care, it may not flower, or worse, may even die. Here are some tips to revive a Christmas cactus that is struggling: -Water the plant sparingly, allowing the soil to dry out between waterings. Too much water can cause the plant to rot. -Feed the cactus a weak fertilizer once a month during its growing season.