Dendrobium is a genus of mostly epiphytic and lithophytic orchids in the family Orchidaceae. It is a very large genus, containing more than 1,800 species.
Dendrobiums need lots of light, but not direct sun. A lightly shaded south window is best. East or west facing windows are satisfactory if bright (avoid direct sun except at the beginning or end of the day). Dendrobiums can withstand hot weather if adequate ventilation and humidity are provided.
Since Dendrobiums are often large plants in small pots, they should be watered relatively frequently, sometimes as much as twice a week. Your plant should be almost dry before watering, though. Seasonally, water Dendrobiums less in the fall and winter, and gradually more as temperatures rise in the spring and summer.