I have several aprox. 60 yr. old cedars around our house on a 1/2 acre in Langley. All are very healthy except one in our front yard. It is the same height and diameter as the other trees, but the foliage is not as healthy in appearance and is much thinner and thinning more each year. The soil is sand and gravel with a good rich top layer of dark soil and composted bark mulch. It is watered with our sprinkler system and all the native plants growing beneath it are doing very well. What may be the possible causes and what can I do to save the tree? Who would be a good person to call for help?