Native Plants A-Z
Asarum caudatum (a-sáh-rum kaw-dáh-tum), commonly known as Wild Ginger, is a low-growing, evergreen ground cover native to the shaded understory of redwood and mixed evergreen forests in the San Lorenzo Valley. Its heart-shaped leaves form dense mats that suppress weeds and conserve soil moisture, creating a lasting presence across seasons. Nestled beneath the foliage, its small, maroon-brown flowers bloom close to the ground in spring, drawing in beetles, gnats, and flies as pollinators.
Wild Ginger plays a subtle but essential role in forest ecosystems. Its seeds are dispersed through a mutualistic relationship with ants, a process known as myrmecochory. Ants are attracted to the nutrient-rich appendages on the seeds, carrying them back to their nests and inadvertently planting them. This dispersal method contributes to the plant’s slow, steady spread, as well as to soil aeration and the ecosystem’s resilience.
This plant thrives in moist, humus-rich soils and deep shade, where it builds layered understories alongside fellow shade-dwellers such as Redwood sorrel (Oxalis oregana), Western trillium (Trillium ovatum), Creeping snowberry (Symphoricarpos mollis), Sword fern (Polystichum munitum), and Western bleeding heart (Dicentra formosa). Together, these plants create a stable and biodiverse forest floor, offering shelter for invertebrates, amphibians, and small mammals.
The dense and persistent foliage of Asarum caudatum helps prevent erosion. It forms evergreen mats through its rhizomatous growth, especially on slopes and streambanks. Over time, these mats support food webs across multiple trophic levels. Herbivorous insects feed on plant material; birds and amphibians prey on these insects; and tertiary consumers such as hawks, foxes, and coyotes complete the food web. Decomposers—including fungi and soil invertebrates—play a crucial role in cycling nutrients. By anchoring food webs and protecting soil life, Wild Ginger helps to sustain long-term forest health.
Gardeners value Asarum caudatum for its shade tolerance, deer resistance, and adaptability in low-light gardens. With minimal maintenance, it establishes itself as a keystone plant of shaded native plantings and woodland gardens.
Wild Ginger
Asarum caudatum
a-sáh-rum kaw-dáh-tum
KEY DETAILS
Plant Type
- Low-growing perennial groundcover (forb)
- Locally native to the Santa Cruz Mountains, including the San Lorenzo Valley
- Spreads by creeping rhizomes to form dense mats beneath forest canopies
Light
- Prefers deep to dappled shade
- Cannot tolerate direct sun in low-moisture conditions
Soil
- Thrives in rich, humus-laden forest soils with high organic matter
- Prefers moist, well-drained conditions and does poorly in compacted or dry soils
- Often found in redwood duff or loamy woodland soils with good drainage and consistent moisture
Size
- Foliage height: 4–8 inches
- Spreads slowly but steadily by underground rhizomes, eventually forming colonies
Bloom Time
- Spring (typically March to May in the Santa Cruz Mountains)
- Maroon to brownish-purple flowers bloom hidden beneath foliage
Sun Exposures per day
Shade: Less than 3 hours of direct sun
Part shade: 3-4 hours of direct sun
Part Sun: 5–6 hours of direct sun
Full Sun: Receives 6+ hours of direct sun