Maintain moist soil conditions at all times. A Stelis orchid does not grow well if you allow the soil to dry out between waterings.
Grow a Stelis orchid near a window so it receives indirect sunlight. Keep Stelis orchids away from heat sources such as a stove or a radiator. Ideally, temperatures should average between 55 and 60 degrees Fahrenheit at night and 75 to 80 degrees during the day.
Set the Stelis orchid on a tray filled with rocks and water. This increases the humidity around the orchid. If your house is especially dry -- as it may be during the winter -- consider using a humidifier in the same room as the Stelis orchid.
Fertilize it with an orchid fertilizer, using 1/2 the strength recommended on the label. Fertilize every three waterings in the spring and summer, and then every four to five waterings in the fall and winter.