What could be happening to these trees?

Question

These trees are about 15-20 years old. I don’t know what they are called but some seem to be dying. What could be wrong with them ?

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Answer 1

Your arborvitae shrubs look desiccated. Was there a particularly cold, windy and dry winter or hot, dry summer? Even established arborvitae need irrigation during dry spells. I don't see bagworms in the photos, but look up close for those.

https://www.gardeningknowhow.com/ornamental/trees/arborvitae/growing-arborvitae-trees.htm

https://www.gardeningknowhow.com/ornamental/trees/arborvitae/winter-damage-to-arborvitae.htm

https://www.gardeningknowhow.com/plant-problems/pests/insects/treatment-bagworms.htm