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What's wrong with the emerald green arborvitae?

10 years ago

I have a line of emerald green, they were planted last fall. Half of the trees start yellowing on the bottom, ( see pic pls). All these yellow trees are on the side close a big oak(?) tree. But other half of the trees do not have this problem. Any idea what is happening? Is it too dry? we had a dry summer. TIA

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