Most will thrive with one to several hours of sun a day. In the home, east, south or west windows are ideal. Watering should be thorough, and the medium should dry at least halfway through the pot before watering again. This may be every two to 10 days depending on weather, pot size and material, type of orchid and type of potting medium. Many oncidiums require less humidity than other orchids.
Most greenhouses have adequate humidity.
In the home, placing the platns above moist pebbles in trays is ideal. If skies are cloudy, applications once a month are sufficient.