My arborvitae generally look healty and are growing, but a bunch of them have all the tips turning brown.
33+ Green Giant Arborvitae Brown Tips. Useful as specimen or hedge or in groupings or screens. Green giant arborvitae is one of the best trees to choose if you are trying to create privacy.
When Inner Conifer Needles Turn Yellow Or Brown Emerald Green Arborvitae Green Giant Arborvitae Green Giant Tree from i.pinimg.com
The green giant arborvitae, thuja plicata 'green giant', is the fastest growing evergreen shrub that we know of. A row of rich green giants will quickly create a privacy screen the dark green foliage of the green giant plant can grow in a wide range of soils. If not, that may account for the brownish tips you are seeing.
Google ron smith and arborvitae for some excellent information.
These also do great as windbreaks, especially during harsh winters. Green giant arborvitae is one of the best trees to choose if you are trying to create privacy. Water with a drip system whenever possible. This is because they have gorgeous emerald green foliage that is naturally pyramidal, dense, and consistent throughout the year.