How do you kill arborvitae trees?

To kill arborvitae trees, you can use a non-selective herbicide containing glyphosate, applying it directly to the leaves or cutting the tree down and treating the stump with the herbicide to prevent regrowth. Alternatively, you can physically remove the tree by digging it out, ensuring to remove the roots completely. For smaller trees, girdling (removing a strip of bark around the trunk) can also be effective. Always follow safety guidelines and local regulations when using chemicals.