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Island Alum Root
( Heuchera maxima )
Heuchera maxima
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
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60 Nurseries Carry This Plant
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About Island Alum Root (Heuchera maxima)
60 Nurseries Carry This Plant
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A species of flowering plant in the saxifrage family known by the common names island alumroot and Jill-of-the-Rocks. It is endemic to three of the eight Channel Islands of California, where it grows on cliffs. It is rare in the wild due to its limited distribution. It is also cultivated as an attractive garden plant, valued for both its foliage and flowers. This is a rhizomatous perennial herb growing a broad patch of large, rounded, multi-lobed green leaves with long leaf stalks and a fringe of hairs along the edges. It produces an erect flower cluster up to 60 centimeters tall with many clusters of tiny, hairy flowers. Each flower is rounded with fleshy white or pink lobes and tiny petals curling away from the center. The protruding stamens are tipped with large anthers.
It performs best in coastal gardens where it can take full sun to part shade. In inland gardens it may require full shade and additional water. It looks good in woodland gardens.
Plant Description
Plant Type
Perennial herb
Size
1 - 2 ft tall
2 ft wide
Growth Rate
Moderate
Dormancy
Evergreen
Fragrance
None
Flower Color
Pink, White
Flowering Season
Winter, Spring
Wildlife Supported
Hummingbirds love the flowers
Butterflies & moths hosted ( 1
likely
* )
SHOW ALL
*
White-lined Sphinx
Hyles lineata
Hyles lineata
Landscaping Information
Sun
Full Shade, Part Shade, Full Sun
Moisture
Low, Very Low
Summer Irrigation
Max 3x / month once established
Nurseries
Carried by 60
Ease of Care
Very Easy
Cold Tolerance
Tolerates cold to 12° F
Soil Drainage
Fast, Medium
Soil Description
Prefers sandy/rocky soil with good drainage. Soil PH: 6.0 - 8.0
Common uses
Groundcovers, Hummingbird Gardens, Bird Gardens
Companion Plants
Use with other island species such as: Trees -
Island Ironwood
(
Lyonothamnus floribundus
ssp. asplenifolius),
Island Cherry
(
Prunus ilicifolia
ssp. lyonii),
Island Oak
(
Quercus tomentella
) Shrubs and herbs -
Island Ceanothus
(
Ceanothus arboreus
),
California Encelia
(
Encelia californica
),
St. Catherine's Lace
(Eriogonmum giganteum),
Santa Rosa Island Sage
(
Salvia brandegeei
), Manzanita (
Arctostaphylos species
),
Dudleya species
,
Yucca species
Propagation
?
For propagating by seed: No treatment.
Natural Setting
Site Type
Chaparral or coastal sage scrub on rocky or sandy cliffs and sea bluffs of the northern Channel Islands
Climate
Annual Precipitation: 11.7" - 29.4", Summer Precipitation: 0.15" - 2.72", Coldest Month: 37.8" - 55.6", Hottest Month: 59.0" - 70.4", Humidity: 1.36" - 15.81", Elevation: 38" - 6918"
Alternative Names
Common Names
: Island Alumroot, Jill Of The Rocks, Jill-of-the-rocks
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Island Alum Root
Heuchera maxima
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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