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Island Manzanita
Arctostaphylos insularis
About Island Manzanita (Arctostaphylos insularis) Nurseries Show All Photos Arctostaphylos insularis is a species of manzanita known by the common name island manzanita. It is endemic to Santa Cruz Island, one of the Channel Islands of California. It grows in chaparral and woodland. This is a large, spreading shrub ordinarily reaching over two meters tall and known to exceed five meters in height. It has waxy, reddish bark and the smaller twigs sometimes have bristly hairy hairs. The leaves are shiny green and smooth, generally oval in shape and slightly convex, and up to about 4.5 centimeters long. The shrub blooms in many dense clustered flower clusters of urn-shaped flowers. The fruit is an orange-brown drupe up to 1.5 centimeters wide. Its long bloom time makes it a good choice for the coastal southern California garden where it will get some moisture from fog drip.
Plant Description
Plant Type

Max. Height
6.6 - 16.4 ft (2 - 5 m)

Max. Width
10 ft (3.0 m)



Growth Rate
Moderate, Slow


Flower Color
Pink, White, Orange, Brown

Flowering Season
Spring, Winter

Native Status

Natural Setting
Site Type
Rocky slopes and coastal bluffs of the northern Channel Islands

Part Shade, Sun

Elevation ?
27' - 1695'

Annual Precip. ?
12.2" - 19.2"

Summer Precip. ?
0.14" - 0.26"

Coldest Month ?
47.4° F - 53.8° F

Hottest Month ?
62.7° F - 70.8° F

Humidity ?
1.37 vpd - 15.81 vpd

Soil Description
Tolerant of sand and clay

Soil PH
6.0 - 8.0

Fast, Medium, Slow

Cold Tolerance(° F)
Tolerates cold to -5° F

Sunset Zones ?
15, 16, 17, 18, 19, 20, 21, 22, 23, 24

Wildlife Attracted
Hummingbirds and insects are attracted to the flowers. Various birds and other animals are attracted to the fruits.

Landscaping Information
Ease of Care
Moderately Easy

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

Moderately Popular

Max. Summer Water ?
No Summer Water
Keep moist

Organic with Rocks

Propagation ?
By seeds or cuttings

Common uses
Hedges, Deer Resistant, Bird Gardens, Hummingbird Gardens, Bee Gardens

Nursery Availability
Commonly Available

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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