Incense Cedar

Calocedrus decurrens

Cupressaceae · coniferous tree · introduced

Last updated

Incense cedar (Calocedrus decurrens, Cupressaceae) is a slow-growing native conifer from western Oregon to Nevada and south into California, found at elevations of 700 to 2,500 meters. It develops a narrow conical form reaching 70 to 110 feet in cultivation and 100 to 150 feet in the wild, with a lifespan exceeding 1,000 years. Dense fan-like sprays of lustrous dark green foliage show little winter browning. Light to reddish-brown bark and cylindrical female cones with distinctive paired scales resembling duck beaks are identifying features.

Incense cedar grows in sun to part shade on a range of soils, preferring moist, well-drained, slightly acidic sandy loam (pH 4.6 to 7.1), hardy in Zones 5a to 8b. It has low water needs, medium drought tolerance, and a minimum root depth of 60 inches. Maintenance is low. Documented diseases include Seiridium canker, Port Orford cedar root rot, leaf blight, and cedar flagging. The cultivar 'Maupin Glow' offers yellow-and-green foliage at 8 feet. The wood has been the primary material for wooden pencils due to its soft, easily sharpened character.

Plant Profile

Size & Form

Height
40-80 ft
Spread
6-15 ft
Growth Rate
Moderate
Size at 20 yr
20-30 ft
Lifespan
Long

Site Requirements

Light
Sun to Part Shade
Soil Drainage
Adaptable
Soil pH
4.6-7.1
Water
Low
Drought Tolerance
Medium
Hardiness
Zones 5a–8b

Ornamental Interest

Bloom Time
late spring
Origin
Western Oregon to Nevada

Diseases: Regionally Documented (7)

Phenological Calendar

View full calendar (5 stages)
Stage Typical Window
'New growth flush' BBCH '11' 'February 15 - March 15'
'Pollen release' BBCH '61' 'May 1 - May 31'
'Pollen shed complete' BBCH '69' 'May 15 - June 15'
'Cone development' BBCH '71' 'June 1 - August 31'
'Cone maturity and seed shed' BBCH '85' 'September 1 - November 30'
Cultivars (1)
'Maupin Glow'
Yellow and green variegated foliage. Dwarf form, mature height 8 ft. source: OSU Landscape Plants
Hardy to USDA Zone 6. source: OSU Landscape Plants
Data Maturity
Baseline Extension data. Expert review underway.