justgardenthings
Christmas cacti need bright, indirect sun. They'll burn in direct sunlight, so if you're placing yours indoors near a west or south-facing window, make sure it's filtered with a sheer curtain.
They like humidity, so if your house is dry indoors in winter, put it on a tray of pebbles, or place it near other plants.
Water when the top surface feels dry, and never let them sit in water.
Christmas cacti prefer daytime temperatures of 65 to 70 degrees, and evening temperatures of 55 to 65 degrees.
To make sure your cactus blooms well, fertilize monthly from June through August with a balanced houseplant fertilizer at half-strength.
Although they enjoy plenty of bright sun, make sure it's indirect, as direct sunlight can burn the leaves.