|Eastern White Cedar - Thuja occidentalis - Page 2|
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As with other trees, cedars shed old foliage in fall. Sometime in September, part of the foliage- usually in the interior of the tree- will turn rusty brown and slowly fall off (figures 7 and 8). If you're not sure whether your tree is shedding or dying, pulling at the brown foliage is a reliable test, because the foliage about to be shed comes off easily, while the foliage about to die requires a lot of force to remove. From my own observation, I believe that this natural shedding can be reduced by timing one of the heavy pruning sessions to occur around the middle of August.