Watering
In the house, orchids are grown in pots filled with chips of bark, stones, treefern or some other loosely packed material, which keeps roots well-aerated and permits water to drain quickly. Nothing -- repeat, nothing -- kills an orchid faster than letting it sit in a water-logged pot, since a lack of oxygen will cause the roots to suffocate and rot. Water orchids thoroughly, usually about once a week, then allow them to dry slightly before watering again. Orchids are better equipped to withstand periods of forgetfulness than they are to being overwatered.