Native plants for San Francisco

Coast live oak is the structural and biological heart of the woodland and savanna communities that define the California Coast Ranges, from Mendocino south through the hills ringing Los Angeles — a canopy that moderates temperature extremes, intercepts coastal fog, and drips moisture into the soil through rainless summers.

Coast live oak is the structural and biological heart of the woodland and savanna communities that define the California Coast Ranges, from Mendocino south through the hills ringing Los Angeles — a canopy that moderates temperature extremes, intercepts coastal fog, and drips moisture into the soil through rainless summers. It hosts 163 species of native Lepidoptera in California, including the California sister butterfly, whose caterpillars feed on the emerging spring foliage before the acorns form. Western scrub-jays are the tree's primary seed disperser, caching thousands of acorns each fall and recovering fewer than they store, an act of forgetting that has moved coast live oak steadily up coastal hillsides over millennia. The canopy architecture of mature trees — wide-spreading, with heavy horizontal limbs — creates nesting platforms that red-tailed hawks and great horned owls return to for decades. In restoration plantings across coastal Southern California, coast live oak establishes native understory plants beneath it within five to ten years simply by moderating soil temperature and generating leaf litter, accelerating community assembly faster than any other native canopy species.

Thimbleberry is the defining fruit shrub of California's shaded montane understory — a rhizomatous colonizer that spreads into broad, shoulder-high colonies beneath coast redwoods and Sierra mixed-conifer canopies, forming one of the most productive soft-fruit layers in the state's forested terrain.

Thimbleberry is the defining fruit shrub of California's shaded montane understory — a rhizomatous colonizer that spreads into broad, shoulder-high colonies beneath coast redwoods and Sierra mixed-conifer canopies, forming one of the most productive soft-fruit layers in the state's forested terrain. The large white flowers produce abundant pollen but no nectar, concentrating visits from Bombus vosnesenskii queens that press their pollen baskets directly into the open anthers and from Osmia mason bees that forage intensively before the brief bloom window closes. Those drupes draw Steller's jays and Pacific-slope flycatchers in July, but black bears are the most consequential consumers, moving through colonies and depositing seeds in open disturbed microsites where new colonies take hold. Thimbleberry hosts 72 California Lepidoptera species, and in north-coast forests that figure translates into dense caterpillar populations on the broad, soft leaves — a food source that Wilson's warblers time their nesting to coincide with. The rhizome network also stabilizes the loose duff layers characteristic of steep, shaded north-facing slopes where few other shrubs establish.

Yellow bush lupine is the defining shrub of California's coastal dune systems, a fast-growing nitrogen-fixer whose rhizobial root nodules pump fixed atmospheric nitrogen into soils so impoverished that they would otherwise support only sparse annuals for decades.

Yellow bush lupine is the defining shrub of California's coastal dune systems, a fast-growing nitrogen-fixer whose rhizobial root nodules pump fixed atmospheric nitrogen into soils so impoverished that they would otherwise support only sparse annuals for decades. It hosts 49 species of native Lepidoptera in California, and the gray hairstreak butterfly is a consistent presence, its caterpillars feeding on developing seed pods while adults nectar on the dense flower spikes. White-crowned sparrows shelter and forage within the dense interior branch structure, which provides one of the few structurally stable nesting platforms in an otherwise windswept and open coastal environment. The keel-and-banner flower architecture reserves pollen for strong-bodied visitors: Bombus californicus workers pry open florets with their legs, triggering explosive pollen release in a burst — a mechanism that excludes smaller, less effective visitors. In northern California, yellow bush lupine has become so effective a soil builder that its dense stands along the Humboldt and Mendocino coast have paradoxically suppressed the native dune flora they originally stabilized, making its management a complex restoration challenge.

California goldenrod anchors the late-season ground layer of oak woodland edges, dry slopes, and coastal scrub from the Coast Ranges to the Sierra Nevada foothills — often the last flowering perennial standing when the Mediterranean summer has exhausted everything else.

California goldenrod anchors the late-season ground layer of oak woodland edges, dry slopes, and coastal scrub from the Coast Ranges to the Sierra Nevada foothills — often the last flowering perennial standing when the Mediterranean summer has exhausted everything else. Its pollen-rich plumes are the primary fall resource for specialist bees in the genus Melissodes, whose females pack goldenrod pollen almost exclusively into brood cells, timing their emergence to match the bloom with near-perfect precision. Painted ladies and red admirals fuel southward migration on the nectar, and lesser goldfinches work the spent seed heads through November, extracting achenes from the papery bracts. Beyond direct feeding relationships, the dense clumping stems provide overwintering structure for solitary bees and beneficial wasps that lodge in hollow or pithy stalks. California goldenrod is also a documented larval host for at least 139 native Lepidoptera species — a productivity that rivals shrubs many times its size and makes it one of the most ecologically leveraged plants available to a California restoration planting.

California aster anchors the coastal and riparian meadow edge as one of the last native forbs to hold the fall nectar window open, bridging the gap between the dry summer dormancy and winter rains across much of the California coast.

California aster anchors the coastal and riparian meadow edge as one of the last native forbs to hold the fall nectar window open, bridging the gap between the dry summer dormancy and winter rains across much of the California coast. It hosts 10 species of native Lepidoptera in California, and its lavender ray flowers draw monarch butterflies during their southward coastal migration — individuals fueling up on aster nectar build the fat reserves that carry them to overwintering groves at Pismo Beach and Natural Bridges. Bombus californicus and native sweat bees in the genus Halictus work the disk flowers intensively from late summer into November, a period when few other native forbs are producing pollen. The plant spreads by both seed and rhizome, forming dense colonies along stream margins and disturbed coastal grasslands that resist annual grass encroachment, making it an effective stabilizer of degraded edges. In restoration plantings along the Central Coast, it reliably self-propagates into adjacent bare soil, bridging disturbed ground faster than most native perennials.

Bearberry forms the living skin of California's most exposed soils — coastal dune edges, rocky bluff tops, and open conifer understories along the northern coast — where its prostrate woody stems weave a mat that resists wind scour and holds sandy ground against erosion.

Bearberry forms the living skin of California's most exposed soils — coastal dune edges, rocky bluff tops, and open conifer understories along the northern coast — where its prostrate woody stems weave a mat that resists wind scour and holds sandy ground against erosion. The small pink urns produce nectar early in the year, drawing queen bumble bees in the genus Bombus breaking winter dormancy and Andrena mining bees among the first to fly. American robins and Townsend's warblers actively forage the red berries through late fall and winter, swallowing the fruit whole and depositing seeds in cleared gaps where new colonies establish. Bearberry's ericoid mycorrhizal network is its less visible but equally important function: the fungal associations acidify surrounding soil and build the organic-matter conditions on which neighboring rhododendrons and native huckleberries depend. On California's Sonoma and Mendocino coasts, it is often the only woody plant stable enough to anchor dune margins that would otherwise migrate inland with seasonal winds.