Native Plant Database

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Wasowski, Sally and Andy (Sun Valley, CA)

Betula occidentalis Hook.

Mountain birch, Water birch

Betulaceae (Birch Family)

Synonyms: Betula fontinalis

USDA Symbol: BEOC2

USDA Native Status: Native to U.S.

Water birch or mountain birch is a 20-30 ft., multi-trunked tree with shiny, reddish-brown bark. Its delicate, graceful appearance is created by slender, spreading, pendulous branches. Shrub or small tree with rounded crown of spreading and drooping branches, usually forming clumps and often in thickets. The red color of the branches and twigs creates the same winter effect as red-twigged dogwoods. The small, deciduous leaves are bright green above and yellow-green beneath becoming bright yellow in fall.

This uncommon but widespread species is the only native birch in the Southwest and the southern Rocky Mountains. Sheep and goats browse the foliage.

 

From the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Tree
Leaf Complexity: Simple
Size Class: 12-36 ft.
Leaf Color: Green
Fruit Color: Green

Bloom Information

Bloom Color: Yellow , Green , Brown
Bloom Time: Apr

Distribution

USA: AK , AZ , CA , CO , ID , MT , NE , NV , NM , ND , OR , SD , UT , WA , WY
Canada: AB , BC , MB , NT , NS , ON , SK , YT
Native Distribution: AK, e. of the Cascades to CA, e. to s. Man., the Dakotas & n. NM
Native Habitat: Wooded, mt. ravines; stream banks; bottomlands
USDA Native Status: L48(N), AK(N), CAN(N)

Growing Conditions

Water Use: High
Light Requirement: Sun , Part Shade , Shade
Soil Moisture: Moist
CaCO3 Tolerance: Low
Soil Description: Moist soils.
Conditions Comments: Do not prune until summer when the sap has stopped flowing. Susceptible to borers, aphids, and other problems when grown in dry soil. Does not cast heavy shade, permitting underplanting.

Propagation

Description: Sow seed as soon as ripe. Germination is facilitated by exposure to light; never plant too deeply.
Seed Collection: Birch seed is collected by picking the catkins while they are still green enough to hold together. They shatter easily and should be put directly into bags.
Seed Treatment: One month cold stratification compensates for light treatment.
Commercially Avail: yes
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From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Santa Barbara Botanic Garden - Santa Barbara, CA

Recommended Species Lists

Find native plant species by state. Each list contains commercially available species suitable for gardens and planned landscapes. Once you have selected a collection, you can browse the collection or search within it using the combination search.

View Recommended Species page

Additional resources

USDA: Find Betula occidentalis in USDA Plants
FNA: Find Betula occidentalis in the Flora of North America (if available)
Google: Search Google for Betula occidentalis

Metadata

Record Modified: 2007-12-23
Research By: TWC Staff

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