Answer: Browning can be caused by a pest or disease problem, poor rooting and transplant shock, root damage due to over or underwatering, accidental herbicide or chemical exposure, and even by overfertilizing. Depending on which kind of plant you have, there may also be some normal seasonal change along with normal needle drop. It is very difficul to diagnose browning long distance. I would suggest you work with your local professionally trained nurseryman to try to determine what is happening and then once you know that for sure, determine how to proceed. I'm sorry I can't be more specific for you.
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