Which of the following is known as Emerald Green Arborvitae?

The name "Emerald Green Arborvitae" specifically refers to the cultivar of Thuja occidentalis known as 'Emerald Green.' This evergreen plant is prized for its dense, upright growth habit and vibrant green foliage that retains its color throughout the year. It is commonly used in landscaping for hedges and privacy screens due to its narrow form and ability to thrive in a variety of soil conditions while maintaining a tidy appearance.

In contrast, Thuja plicata, commonly known as Western Red Cedar, is a different species that has a much larger growth habit and is not referred to as 'Emerald Green.' Chamaecyparis pisifera 'Sungold' is an entirely different species and cultivar that features golden foliage, making it visually distinct from the rich green of the 'Emerald Green' Arborvitae. Similarly, Juniperus horizontalis 'Wiltoni' is a spreading juniper with a different growth structure and foliage coloration, also not related to the characteristics of an Arborvitae.

The specificity of the name 'Emerald Green' directly links it to Thuja occidentalis, highlighting its popularity and recognition in horticulture for its aesthetic and practical attributes in landscape design.