Growing orchids in water? There are some that do what is called "semi-hydro", but in water all the time? A few of us experimented with some phals in water awhile back, and while I'm not aware of what happened to the other's plants, eventually mine all rotted and died. I'm not sure i've heard of growing them that way as orchids are generally found growing on trees, rocks etc. May I ask where you found the idea?? See, orchid roots are not like normal plant roots, as they must have some airflow around their roots to keep them healthy. And while there is a method with the Vanda types where you fill a glass vase with water, after a few minutes soak you dump the water out. Perhaps someone else has successfully raised one this way, but if I were you i'd dump the water and find a nice bark mix sized according to what type of orchid you have.