Like most other cultivated orchids, dendrobiums are epiphytes, or air plants. They should be potted in porous, free-draining media, never potting soil. There are many different types of dendrobiums available, many of which bloom twice a year and some that only bloom in spring or fall. Denphalaenopsis is one of the fall blooming species which will be available through Bloomin' Delights in the coming weeks. Sufficient light is important for healthy growth and flower production.
Most homes have insufficient light to re-bloom dendrobiums.
Dendrobiums need bright light, an eastern or southern exposure which provides some shade during the hottest part of the day is ideal. The rule is, give the plant as much light as it can take without burning the leaves. Leaf burn happens very quickly, so check the plants often. Mature plants need a 15 to 20 degree difference between night and day which is another reason to grow these plants outside until night temperatures dip below 50. Temperatures below 50 degrees may cause leaf drop.