The main part of a bromeliad dies after flowering, leaving new shoots to take its place. These can either be grown on as a group, or divided and grown on for a few years until mature. Once the bromeliad is as large as your original plant was when it flowered, place a clear plastic bag over it for a week, with a ripe apple inside. The apple releases ethylene, a gas that initiates flowering.
For this beautiful spring- and summer-flowering bulb to flower, it needs a period of cold dormancy. While it likes a warm spot for most of the year, from late fall to late winter, keep it dry and at about 50 degrees F. Water again from early spring and give it a liquid feed every other week. As growth begins, move the plant to a warmer spot to flower, water it slightly less and begin the cycle again. Clivias actually likes to be pot-bound, so repot infrequently.
To flower well, Christmas cacti need plenty of light during the summer. If grown indoors, keep them on a sunny windowsill. If placed outside, shade them a little to prevent them from scorching. To persuade them to flower, give them short days and long nights. So, from fall to Christmas, keep them in a room that's not lit at night, such as a spare room or a child's bedroom.
If the growing conditions are right, it's fairly easy to get moth orchids to reflower. They don't like too much light, so grow them on a west- or east-facing windowsill during winter, and in a shadier spot in summer. Water weekly in summer with rainwater, taking care to avoid the crown. Reduce watering in winter. If you have a plant in flower, just as the last bloom is fading, trim the spike slightly below where the first flower opened. A bud there will sprout a second flower spike, which itself can be trimmed to give a third. To encourage a moth orchid to flower again from scratch, keep it humid, give it a diluted feed once a month, and keep it at about 59 degrees F at night and 70-77 degrees F during the day. This fluctuation, combined with feeding and humidity, will initiate new flowers.