Chamaecyparis lawsoniana 'Duncanii' / Duncan's Lawson cypress

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.

Chamaecyparis lawsoniana 'Duncanii' — a mature specimen.
Photo by Bill Barger

Chamaecyparis lawsoniana 'Duncanii' — a closeup of foliage detail.
Photo by Bill Barger

Chamaecyparis lawsoniana 'Duncanii' / Duncan's Lawson cypress

RECOMMENDED HARDINESS ZONES:
5 (-10 to -20 F / -23.3 to -28.9 C)
9 (20 to 30 F / -1.1 to -6.7 C)

HORTICULTURAL STATUS: Established
ORIGIN: Seedling Selection
COLOR: Blue Green
TRINOMIAL TYPE: Cultivar
GROWTH SHAPE: Globe or Globose
GROWTH SIZE: Dwarf: 1 to 6 inches (2.5 – 15 cm) per year / 1 to 5 feet (0.3 – 1.5 m) after 10 years

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Comments

Karen Aranas

It is the beginning of February in Willamette Valley Oregon (Zone 8). Two Chamaecyparis Duncanii were planted in February 2021, and some of the branchlets have become brown, more on one side than the other. Shall I cut off all the brown parts and is this a good time to do that?