Chamaecyparis lawsoniana 'Duncanii' is an unusual flat-topped, irregularly globose, bushy selection of Lawson cypress with thread-like, slightly twisted filamentous branchlets of Blue-green foliage. After 10 years of growth, a mature specimen will measure 28 inches (70 cm) tall and wide an annual rate of growth of 2 to 3 inches (5 - 7.5 cm).
This cultivar originated as a seedling selected in the early 1920s by V. C. Davies, New Zealand and introduced to the nursery trade in 1953 by Duncan and Davies nursery, New Zealand.