Green cones

Scientific Name

Juglans californica

Full Sun

Part Sun

Part Shade


Max. Height × Width

50–75 feet × 50–75 feet

Price & Availability

Forestry pot 14 inch


10 available

We have a special affection at LANPS for this undervalued and abused species. Once a familiar sight in the Los Angeles area, Juglans californica is now endangered, a victim of unchecked development. This makes it an ideal plant for those of us trying to support local wildlife with our gardening practices.

Like its under-appreciated stepsister, Sambucus nigra ssp. caerulea (Blue Elderberry), Southern California Black Walnut’s charms can sometimes be subsumed by its obvious deficits as a garden plant. First, its leaves tend to turn almost black and fall off at the height of summer, just when you might wish for a more leafy canopy, and it may remain leafless until the following mid-winter. Second, like other walnuts, Juglans californica emits an allelopathic compound from its roots called juglone, which inhibits the growth of other plants. (We have never seen any negative impact from this among the Walnut understory plants at the LANPS garden, but there you are.)

Southern Black Walnut’s growth rate is moderate, and it can thrive on southwest-facing slopes with a little supplemental summer irrigation, though it may be happiest among oaks or in a riparian or semi-riparian habitat. The fruits are humanly edible, but with their adamantine shells, it’s hardly worth the effort. We offer young Juglans californica seedlings in deep, forestry pots that make room for their long taproots and keep them from coiling, resulting in a healthy, faster-growing tree.

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Bitter Gooseberry

Ribes amarum


Blue Dicks

Dipterostemon (Dichelostemma) capitatus

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Blue Elderberry

Sambucus nigra ssp. caerulea

Blue Wildrye

Elymus glaucus

Branching Phacelia

Phacelia ramosissima

Brickell Bush

Brickellia californica

California Aster

Corethrogyne filaginifolia

California Aster

Corethrogyne filaginifolia

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California Four O’Clock

Mirabilis laevis var. crassifolia

California Fuchsia

Epilobium canum ssp. canum

California Prickly Phlox

Linanthus californicus

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Canyon Dudleya

Dudleya cymosa

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Cardinal Catchfly

Silene laciniata

Caterpillar Phacelia

Phacelia cicutaria

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Coast Live Oak

Quercus agrifolia

Coast Prickly Pear

Opuntia littoralis

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Frangula californica

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Fiesta Flower

Pholistoma auritum

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Fuchsiaflower Gooseberry

Ribes speciosum

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Hollyleaf Redberry

Rhamnus ilicifolia

Longstem Buckwheat

Eriogonum elongatum

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Mountain Mahogany

Cercocarpus betuloides

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Poison Oak

Toxicodendron diversilobum

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Punch Bowl Godetia

Clarkia bottae


Claytonia perfoliata

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Round Leafed Boykinia

Boykinia rotundifolia

Sacred Datura

Datura wrightii

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Santa Barbara Honeysuckle

Lonicera subspicata var. denudata

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Saw-Toothed Goldenbush

Hazardia squarrosa var. grindelioides

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Scarlet Larkspur

Delphinium cardinale

Silver Puffs

Uropappus lindleyi

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Soap Plant

Chloroglaum pomeridianum

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Southern Bush Monkeyflower

Diplacus longiflorus

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Spotted Humboldt’s Lily

Lilium humboldtii ssp. ocellatum


Helianthus annuus

Threadleaf Ragwort

Senecio flaccidus

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Heteromeles arbutifolia

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Western Columbine

Aquilegia formosa

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Western Wallflower

Erysimum capitatum

Wild Heliotrope