Question
hello and thanks for answer my question . I have too much orchids with rotted roots and most of them are dehydrated ; I took out all deaths roots ,then I tried with the plastic bag method ( putting my orchid in a mounted piece of cork , with moist stones at the bottom of the bag to increase the humidity),I prepared a solution of vitamin B which with I water my orchids and I red that making a willow tree  tea and rice that has nitrogen, phosphorus and vitamin B  will make my orchids produce new roots.My questions are these ones. 1 are my methods such as the solution,and bag are ok to produce new roots? 2 do you know other method that can help me?  3 how can I rehydrate my orchids with no roots?

Answer
Jorge,   the plant and its roots must not come into contact with solutions. The most common method involving bagging is to place a bit of damp moss in the bag with the plant to create humidity. If the plant gets wet there is a danger of rot setting in.  Secondly, you must have at least one good root on a plant (ie the root must be firm). Thirdly, you must have healthy meristemmatic tissue in the area where roots and leaves originate.

Willow tree tea contains ingredients that are antimicrobial so may protect against bacterial and fungal infections.  However, new roots can only emerge if the meristemmatic tissue from which they emerge is healthy.  Dehydrated leaves appear as such because dead roots are no longer capable of providing the needed plant sap and nutrients.  It is likely that these dehydrated leaves will not recover and will eventually become detached from the plant.

My recommendation is to continue with what you are doing.  Reduce the light level for the bagged plants.  You may want to try the moss method for one of the plants to see if it does any better.

To avoid this adverse effect in the future, pot all of your orchids in an open potting mix that allows good drainage and air movement through the potting mix.  I prefer a commercial grade of fir bark based potting mix in a pot with lots of drainage holes and repot annually.  I prefer not to pot in moss as it compacts over time and tends to stay too wet or dries out and is difficult to rewet.