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Presidio Manzanita Back to Plant Page
Arctostaphylos montana ssp. ravenii

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About Presidio Manzanita (Arctostaphylos montana ssp. ravenii) Presidio Manzanita (Arctostaphylos hookeri ssp. ravenii) is a rare native shrub whose only documented location in the wild is in Presidio Park, San Francisco. It is listed by State and federal agencies as an Endangered Species. The U.S. Fish and Wildlife Service says that only one individual of this subspecies remains in the wild and no wild seedlings of this plant have been observed. However, it has been propagated from seeds and cuttings for conservation purposes, and it is sometimes available for garden use. It was formerly classified as Arctostaphylos hookeri ssp. revenii and some sources may still refer to it by that name.
Plant Description
Plant Type

Max. Height
2 ft (0.6 m)

Max. Width
5 ft (1.5 m)



Flower Color

Flowering Season
Spring, Winter

Native Status
Natural Setting
Site Type
Presidio Park, San Francisco

Part Shade, Sun

Elevation ?
69' - 878'

Annual Precip. ?
24.3" - 27.7"

Summer Precip. ?
0.27" - 0.33"

Coldest Month ?
49.1° F - 50.9° F

Hottest Month ?
62.0° F - 64.6° F

Humidity ?
1.19 vpd - 9.86 vpd

Soil Description
The sole remaining individual is growing on a serpentine outcrop. However, it appears to be tolerant of normal garden soil.


Companion Plants
This plant can be used with most other northern chaparral plants. However, due to its rarity in the wild, it would be shown to best advantage when used with other plants commonly found in the vicinity of Presidio Park, such as Yerba Buena (Clinopodium douglasii), Oneleaf Onion (Allium unifolium), Sitka Columbine (Aquilegia formosa), California Mugwort (Artemisia douglasiana), Hairy Ceanothus (Ceanothus oliganthus), Blueblossom (Ceanothus thyrsiflorus), Canyon Dudleya (Dudleya cymosa), Mission Bells (Fritillaria affinis), Broadleaf Stonecrop (Sedum spathulifolium),

Landscaping Information
Water Requirement ?
Extremely Low
Very Low
Moderate - High

Rarely Used

Max. Summer Water ?
No Summer Water
Keep moist

Common uses
Deer Resistant, Hummingbird Gardens, Bee Gardens

Nursery Availability
Rarely Available

Other Names
Botanical Names
Arctostaphylos hookeri ssp. ravenii

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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