I have several now and they live in mt conservatory where they are baked all summer long! I only water when the compost is dry, or they look a little limp (not ideal!) and feed when I feed the others. They are potted in free draining gritty compost. They flower as the days shorten in winter, thus Christmas Cactus. Be warned, once the flower buds are showing, try not to turn the plant or move it's location as the buds turn to follow the sun and can twist clean off the plant! I reakon yours will flower this winter.