We have 4 cedar trees in our front yard. We just bought the property 2 months ago and do not know how the trees have behaved in the past. The trees are likely Western Red Cedars but I'm unsure. they are 15" to 36" in diameter at their bases. I began removing a serious mature English Ivy infestation from them 3 days ago. Basically cutting the vines away from the base of the trees 10 ' up. the trees appear to all be showing more yellowing or dead branches all of a sudden and I am wondering if this has something to do with the ivy removal or if it could it be coincidental and something else. Do branches die off on a seasonal basis? Are there phases such as this which cedars go through? any feedback would be greatly appreciated. We do not want to lose these trees.