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Western Poison Oak

Toxicodendron diversilobum

Toxicodendron diversilobum, commonly named poison oak, Pacific poison oak or western poison oak, is a woody vine or shrub widely distributed in western North America. It is common in various habitats, from riparian zones to dry chaparral. It thrives in shady and dappled light through full and direct sunlight conditions. It is one of the more common shrubs in California, growing throughout the coastal and coast mountain ranges, the Transverse mountain ranges, through the Sierra foothills, and in the Sacramento Valley. It is extremely variable in growth habit and leaf appearance, growing as a dense tall shrub in open sunlight, and a treelike vine or dense thickets in shaded areas. It reproduces by spreading rhizomes and by seeds. The plant is winter deciduous, so that after cold weather sets in, the stems are leafless and bear only the occasional cluster of berries.


Poison oak is known for causing itching and allergic rashes in many humans after contact by touch or smoke inhalation. Because of this, it is usually eradicated from gardens and public landscaped areas. However, it can be a carefully situated component in wildlife gardens, habitat gardens, and natural landscaping. The plant is used in habitat restoration projects. It can be early stage succession where woodlands have been burned or removed, serving as a nurse plant for other species.

Botanist John Howell observed the toxicity of Poison Oak obscures its merits: "In spring, the ivory flowers bloom on the sunny hill or in sheltered glade, in summer its fine green leaves contrast refreshingly with dried and tawny grassland, in autumn its colors flame more brilliantly than in any other native, but one great fault, its poisonous juice, nullifies its every other virtue and renders this beautiful shrub the most disparaged of all within our region."


Black-tailed deer, mule deer, California ground squirrels, western gray squirrels, and other indigenous fauna feed on the leaves of the plant. It is rich in phosphorus, calcium, and sulfur. Bird species use the berries for food, and utilize the plant structure for shelter. Neither native animals, nor horses, livestock, or canine pets demonstrate reactions.

Mission Manzanita

Xylococcus bicolor

Mission Manzanita is a shrub that grows up to 20 feet tall, and 20 feet in diameter. Its native range is very limited, comprising Southwestern and Pacific coastal California from San Diego county through north-central Pacific coastal Baja California, a small area in the foothills northwest of Pasadena in Los Angeles Country, a bit of southern Riverside County near Temecula, and Santa Catalina Island. Mission Manzanita is a slow growing shrub that resembles the true manzanitas (Arctostaphylos).

The form is upright or rounded, with one or multiple trunks. Leaves are oblong, glossy dark green on the top and very light colored with a felty texture on the underside. The edges of the leaves curl under as they age. Bark is smooth and a red-gray color. Flowers, which appear from December to February depending on rainfall, are white to pink in color blending to yellowish at the open end, 8-10 millimeter; in length and hang like bells in small clusters near the ends of branches. Fruit is glossy dark red to almost black, 7 millimeter; diameter and has very little flesh, being mostly a large, woody seed. The name Xylococcus comes from the Greek for "wood berry".

Mission Manzanita is found mixed southern chaparral ecosystems below 3500' elevation on dry, sunny slopes in a very limited range of coastal areas of southern California and northern Baja California. Coyotes and birds, including the California Thrasher and Scrub Jay, eat the fruit. Hummingbirds, especially the resident Anna's Hummingbird, drink nectar from flowers. Various birds nest in Mission Manzanita and many use it for cover. It re-sprouts from a basal burl after fires, and is extremely long lived. Some specimens are estimated to be over 400 years old.

Best to plant Mission Manzanita in early winter, on dry rocky slopes with fast draining soil. Put plenty of mulch and a few good sized rocks near the roots to prevent summer moisture loss. It likes regular light watering (1x every 2 weeks) during the first summer after planting, After established, it should survive the dry months with no supplementary water, though it can usually handle summer watering as much as once per month for it's first 2-3 years. After that, best to naturalize. This plant prefers to have its leaves in full sun, but likes its roots in the shade. Does best on north facing slopes.

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