Chamaecyparis lawsoniana (A. Murray bis) Parl.
Port Orford Cedar, Lawson False Cypress, Lawson's False Cypress
Cupressaceae (Cypress Family)
Synonym(s): Cupressus lawsoniana, Retinispora lawsoniana
USDA Symbol: CHLA
Large evergreen tree with enlarged base, narrow, pointed, spirelike crown, and horizontal or drooping branches. In the wild, this species can grow to 180 ft. or higher. Under landscape conditions, the height is reduced by at least half. The pyramidal evergreen has a massive, buttressed trunk and short ascending branches. Branchets are frond-like and flattened; deep-green foliage is lacy and fern-like. The bark is silvery brown to reddish brown and divided into rounded ridges by deep furrows.
Port Orford Cedar is adapted to the humid climate of the Pacific Coast with its wet winters and frequent summer fog. Logs of the aromatic wood are exported to Japan for woodenware and toys and for construction of shrines and temples; a special use is for arrow shafts. Many horticultural varieties are grown as ornamentals and shade trees, especially in European countries with moist climates. Varieties include columnar, drooping, and dwarf forms and others with foliage of varying shades, ranging from silvery or steel-blue to bright green, and yellowish. The names honor Port Orford, Oregon, located in the center of the range, and Peter Lawson and his sons, Scottish nurserymen who introduced this species into cultivation in 1854.
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Plant CharacteristicsDuration: Perennial
Size Class: 72-100 ft.
Bloom InformationBloom Color: Yellow
Bloom Time: Apr
DistributionUSA: CA , OR
Native Distribution: Shasta, Humboldt, Del Norte & Siskiyou Cos., CA to w. OR
Native Habitat: Moist slopes & canyons below 4800 ft.
Growing ConditionsWater Use: Medium
Light Requirement: Part Shade
Soil Moisture: Dry
CaCO3 Tolerance: Medium
Soil Description: Well-drained, sandy loam.
Conditions Comments: This species thrives in a cool, moist atmosphere where it is protected from drying winds. Too moist a site, however, can encourage a fungus problem. Otherwise the species is relatively free of serious disease or insect problems. The leaves of seedlings and juvenile plants are distinctly different from those of adult trees, being neede-like or awl-shaped.
PropagationDescription: Seed germination is usually low, due in part to poor seed quality, and also to embryo dormancy. Softwood or semi-hardwood cuttings taken in fall are the principal means of propagation.
Seed Collection: Cones mature in Sept. and Oct. at the end of the first growing season. Each cone scale bears from 1-5 winged seeds.
Seed Treatment: Warm-moist stratify for 30 days then stratify 30 more days at 40 degrees. A cool-moist stratification alone may improve germination also.
Commercially Avail: yes
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Santa Barbara Botanic Garden - Santa Barbara, CA
Research LiteratureReslit 274 - Balansia pilulaeformis, an Epiphytic Species (1993) K. Clay and I. C. Frentz
Reslit 582 - Growth and macronutrient accumulation of Chasmanthium latifolium (Michx.) Yates and Hakonechloa macra makino 'Aureola' in response to temperature (2002) M. P. Harvey and M. H. Brand
Reslit 1383 - Ornamental Landscape Performance of Native and Nonnative Grasses under Low-input Conditions (2009) M. Thetford, J. G. Norcini, B. Ballard and J. H. A...
This information was provided by the Florida WIldflower Foundation.
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Additional resourcesUSDA: Find Chamaecyparis lawsoniana in USDA Plants
FNA: Find Chamaecyparis lawsoniana in the Flora of North America (if available)
Google: Search Google for Chamaecyparis lawsoniana
MetadataRecord Modified: 2015-11-16
Research By: TWC Staff