47+ Emerald Green Arborvitae Turning Brown Inside. Emerald green, an arborvitae cultivar of thuja occidentalis, makes a striking addition to the home landscape when planted as a specimen plant, in groupings or as a hedge. Emerald green arborvitae is a cultivar of thuja occidentalis and is an evergreen tree or large shrub.
These needles turn yellow or brown and drop to the ground in late.
Plant one every 4 to 5 feet and they quickly create a dense barrier. Shimmering emerald green foliage with a classic narrow, pyramidal form make the emerald arborvitae attractive in all seasons. Water when the top one inch of soil becomes dry. It keeps a tight foliage.