rockspirea, Holodiscus dumosus  (Rosales: Rosaceae) Holodiscus dumosus with upper branches in bloom, Coconino National Forest, Arizona.
Inflorescence of Holodiscus dumosus, Coconino National Forest, Arizona. Habitat of Holodiscus dumosus, Coconino National Forest, Arizona. Habit of Holodiscus dumosus, Coconino National Forest, Arizona.
Common Name Rockspirea, Bush Oceanspray, Mountainspray
Latin Name Holodiscus dumosus
Family Rosaceae
Sunset zones / USDA zones 1-3, 10 / 3-9
Type / Form Shrub / Large
Native Habitat Mountains and deserts of western North America
Soil Dry, decomposed granite, sand, clay loam low in organic content, well drained
Water Once per month
Exposure Full sun
Height X Width Maximum 15 feet X 10 feet, usual 8 feet X 5 feet
Protective Mechanism None
Leaves Alternate, simple, deciduous, 3/4 to 2 inches long, ovate, and either coarsely toothed or lobed and serrate; entire near the base, prominently penniveined, green above and paler, velvety white below.
Flowers Monoecious; perfect, very small creamy white flowers borne in 2 inch terminal clusters, appearing in late mid-summer. Tiny, light brown, 1-seeded follicles borne in long clusters; fruit clusters persist through the winter and into the next growing season.
Bark / Roots Smooth and gray-brown. Slender, slightly ridged when young but becoming round with time; pith is large, white, and spongy; buds pinkish brown. Basal spouts are very straight and were historically used for arrow shafts.
Maintenance Low
Propagation The seed requires 4 months stratification at 4c. It is best sown as soon as it is ripe in a cold frame. Stored seed should be sown as early in the year as possible. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for at least their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. Cuttings of half-ripe wood with a heel, July/August in a frame. Can be difficult. Layering in spring.
Pests and diseases  
Landscape uses Erosion control, low maintenance, background
Garden Suitability Thornless, Songbird, Mountain
Nature Value Birds use fruit
Native American Uses Medicinal, fruit eaten, tea made from leaves, arrow shafts made from twigs
Links  
    Images and data http://www.cnr.vt.edu/DENDRO/DENDROLOGY/Syllabus2/factsheet.cfm?ID=645
    Images and data http://www.calflora.org/cgi-bin/species_query.cgi?where-calrecnum=4211
    Images and data http://www.hort.usu.edu/PlantGuide/html/Shrubs_and_Trees/Holodiscus_dumosus.htm
    Images and data http://www.fs.fed.us/database/feis/plants/shrub/holdum/all.html
    Images and data http://davesgarden.com/guides/pf/go/1286/
    Images and data http://www.wildflower.org/plants/result.php?id_plant=HODU
    Images and data http://www.pfaf.org/user/Plant.aspx?LatinName=Holodiscus+dumosus
    Images http://www.forestryimages.org/browse/detail.cfm?imgnum=1215008
    Distribution, images and data http://plants.usda.gov/java/profile?symbol=HODU
    Nursery, images, and data http://www.cnplx.info/nplx/species?taxon=Holodiscus+discolor
    Seeds, images, and data http://www.plantsofthesouthwest.com/cgi-bin/plantview.cgi?_recordnum=1268
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