We got pressured by neighbours to trim tops of these cedars last summer. When the alleged arborist cut them he ignored the fact there were already dead branches under the growth he cut. It’s been now more than six months and they have not filled in on top. Even worse they are loosing foliage on a side which faces our living room. Any suggestions on perhaps some fertilizer? Is there hope to at least stop the decline? I should add the sections that got most trim are affected and have a small shed on the ground, you can see to the right the part that is lush.