The Christmas Cactus (or Schlumbergera bridgesii) is a popular, winter-flowering houseplant that makes a great addition to nearly any indoor setting. The cactus blooms at Christmas and also sometimes around Easter time if cared for properly. You will see the tips of the leaves beginning to grow about a month before Christmas. The tips will grow darker as each day passes, until a bud forms. At Christmas time, as if by charm, the buds open to a beautiful flower that will add color and beauty to any holiday season.