Plant of the Month, August 2002 Complete Index
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Mahonia nervosa (Berberis nervosa)

Other cultivars/species:  
Mahonia repens, Mahonia aquifolium ‘Compacta’   

Extra notes and interesting information: Introduced to cultivation in 1822 and now still coveted in Europe. One of our best and most useful native ground covers. The fruits are loved by birds and animals. Native peoples ate the berries raw, mix them with sweeter berries and made them into dry cakes. Bark is bright yellow inside and was used for make a yellow dye for baskets and other materials.
Many botanists now regard Mahonia to be members of the genus Berberis; still usually regarded as Mahonia in the nursery trade.
     

Natural Range: Wide-spread in open woodlands from British Columbia to Northern California, mostly west of the Cascades.
Hardiness:
 USDA Zones 5-9

References:  Brenzel, Kathleen Norris, Ed. 2001. Sunset Western Garden Book, 7th ed. Sunset Publishing Corporation, Menlo Park, CA 

Kruckeberg, A. R., 1982.  Gardening with Plants of the Pacific Northwest. University of Washington Press, Seattle, WA.

Conditions: : Partial to full shade. It requires little water, can grow in full sun with regular water.

at a glance:
Common Name:
longleaf mahonia; Cascade Oregon grape; Cascades mahonia
Location:
Widespread throughout the Gardens native woodlands.
Plant type: Evergreen shrub
Family: Berberidaceae
Height/Spread: Slow growing, 1 to rarely 4 feet tall; spreads 4-5 feet wide.
Leaves: 
Pinnately compound leaves that reach 7-16 inches long and are made up of 11 to19 dark green 2-3 inch long, spiny toothed leaflets.  Leaves become reddish during winter.  Plant creates the impression of a stiff leathery fern.
Flower: 
Early spring flowers are yellow and are borne in upright, 3-6 inch long clusters.  The flowers add an impressive element of color contrast against the foliage during late spring.  The fruit that follows is a round blue-black berry.
Disease/pests: 
 Leaf Spot and Rust can be an aesthetic problem although rarely requires treatment.
Bloom Period: Early spring.


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