They need plenty of water but must have excellent drainage. Most thrive in settings with relatively bright light. Vanilla is a monopodial orchid. It produces a heavy, succulent vine and is relatively east to grow. Unfortunately it is one of the more difficult orchids to bring into flower.
Some orchids thrive at cooler temperatures.
Coarse media such as tree bark, osmunda fiber or moss mounted on tree bark are common. If potted in common media, such as the peatlite mix, orchids usually fail to thrive and eventually die. Terrestrial orchids thrive in a rich, organic medium that drains well. Most orchids grow best in a humid environment with good aeration. They should be watered to keep the medium moist.