Paphs and Phrags are about the only genera that I don't trim back routinely and on many occasions I will trim the roots on Phrags. One of the things that makes orchids different from most plants is the fact that they do not form a main permanent root system. When you repot a plant, most of the roots present on the plant are going to die. Some do this quite rapidly, others take longer. I have always felt that leaving a huge mass of roots that may die and rot fairly soon after repotting is a good way to speed up the breakdown of your potting media. I usually trim the roots so that they do not go down into the pot more than 2/3 to 3/4 of the way. We all have our own favorite potting media, watering schedules, etc as well as variable growing conditions. What works for me (or for Carter and Holmes) may spell sure death for you or other growers. Please understand, I am not criticizing you or others if potting with untrimmed roots works for you. I do object though that what I consider to be a reliable source for quality orchids be condemned for recommending a procedure that has been successful in their hands for years.
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