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California Maiden Hair Fern
Adiantum jordanii

About California Maiden Hair Fern (Adiantum jordanii) Adiantum jordanii is a perennial species Pteridaceae known by the common name California maidenhair. It is native to California and Baja California. It grows in shaded woods, usually in wetter spots such as moist rock outcropping and lower parts of north facing slopes. It can take a little sun near the coast or full shade inland. Each trailing leaf may reach over half a meter in length and is made up of many rounded green segments. Each segment has two to four lobes and it may split between the lobes, the underside of each segment bearing one to four sori. It remains evergreen with regular water or will go dormant if allowed to dry out in summer but should recover. It forms a slowly expanding clump. Adiantum jordanii is a host for the Sudden Oak Death pathogen, and for this reason it may be difficult to find in native plant nurseries.
Plant Description
Plant Type

Max. Height
1.6 ft (0.49 m)

Max. Width
2 - 3 ft (0.6 - 0.9 m)



Evergreen, Summer Semi-Deciduous

Native Status

Natural Setting
Site Type
Shaded streamsides, seeps, springs, moist hillsides, north side of rock outcroppings

Full Shade, Part Shade

Elevation ?
-293' - 4907'

Annual Precip. ?
6.3" - 72.8"

Summer Precip. ?
0.14" - 2.33"

Coldest Month ?
35.3° F - 57.2° F

Hottest Month ?
58.8° F - 80.8° F

Humidity ?
0.05 vpd - 31.82 vpd

Soil Description
Tolerates sand or clay soils

Soil PH
5.5 - 8.2

Fast, Medium, Slow

Cold Tolerance(° F)
Tolerates cold to 15° F

Sunset Zones ?
7, 9, 14, 15, 16, 17

Companion Plants
Landscaping Information
Ease of Care
Very Easy

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

Moderately Popular

Max. Summer Water ?
No Summer Water
Keep moist

Common uses
Deer Resistant

Nursery Availability
Commonly Available

Other Names
Common Names
California Maidenhair Fern

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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