California Native Plant Society

The California Native Plant Society (CNPS) is a California-based environmental nonprofit organization founded in 1965 to conserve the state's native plants and their natural habitats. It also seeks to improve public understanding and appreciation of native flora and to encourage the horticultural use of plants adapted to California's ecological conditions. The organization operates as a grassroots network that combines professional botanical expertise, volunteer activity, scientific information, public education, and policy advocacy. CNPS originated after professional botanists and community activists helped preserve an important native plant garden in Tilden Regional Park in Berkeley. That experience demonstrated the value of sustained public involvement in native-plant conservation and led to the creation of an organization with a continuing statewide mission. Rather than focusing only on individual protected areas, CNPS developed programs addressing rare species, vegetation classification, habitat management, education, horticulture, and environmental decision-making. The society works through regional chapters across California and northwest Baja California, supported by a state office, a board of directors, and a Chapter Council. The reference material describes a network of approximately 35 chapters and nearly 10,000 members and volunteers. Chapter activities include field trips, native plant sales, restoration projects, lectures, workshops, wildflower shows, garden tours, public demonstration gardens, local publications, and community meetings. Many activities are designed for broad public participation and are offered free or at low cost. At the statewide level, CNPS's principal program areas are Conservation, Rare Plant Science, Vegetation Science, Education, and Horticulture. Its conservation work includes engagement with scientists, public agencies, government officials, and regional planners on habitat protection, land-use planning, environmental regulation, and management practices. Its scientific resources are used beyond the society itself: the online Inventory of Rare and Endangered Plants and the California Rare Plant Ranks provide information used by researchers, planners, and agency personnel, while A Manual of California Vegetation and its associated online database serve as important references for identifying and managing California vegetation and critical habitat. CNPS also supports field-based data collection and conservation biology. The Rare Plant Treasure Hunt mobilizes staff and volunteers to revisit and document populations of rare, threatened, and endangered plants. During its first five seasons, from 2010 through 2014, the project updated more than 2,500 occurrences in the California Rare Plant Ranks and the California Department of Fish and Wildlife's California Natural Diversity Database; the reference material states that more than 1,000 of those records were new to science. A related Rare Plant Seed Rescue Project seeks to collect seeds and tissue from rare-plant populations for long-term storage and future conservation use. Public horticulture is another major part of the CNPS identity. The society promotes gardens and landscapes that use plants suited to California's climate and soils, helping reduce demand for irrigation, fertilizers, soil amendments, and pesticides. In 2010, CNPS supported the legislative designation of the third week of April as California Native Plant Week. The organization also operates or supports educational digital resources, including Calscape, launched in 2016 as a searchable database of California native plants, pollinators, and nurseries. Calscape allows users to search by plant or location, explore relationships between plants and pollinators, identify nurseries, and create personal plant lists. CNPS communicates through books, posters, bulletins, newsletters, and the botanical journal Artemisia, formerly known as Fremontia. It convenes a conservation conference every three years and an annual conservation symposium. Overall, the society combines advocacy, science, conservation action, and practical horticultural guidance, positioning native plants as both a biodiversity priority and a foundation for more ecologically appropriate landscapes.

The California Native Plant Society was established in 1965 after a successful effort by professional botanists and grassroots activists to save an important native plant garden in Berkeley's Tilden Regional Park. The campaign created a local example of how scientific expertise and citizen participation could protect native flora, but it also exposed the need for a durable organization able to address threats across California. CNPS therefore developed as a statewide environmental nonprofit rather than as a single-site garden or narrowly focused botanical club. From its beginning, the society's work combined conservation with public understanding. Its mission has been to protect California native plants and their natural habitats, increase appreciation of the state's flora, and encourage the horticultural use of native species. This combination has allowed CNPS to address both direct habitat threats and the broader cultural and practical questions that influence how Californians manage land and gardens. The organization grew through regional chapters supported by statewide coordination. Chapters provide the local base for field trips, restoration work, plant sales, wildflower shows, lectures, workshops, garden tours, demonstration gardens, meetings, and publications. The chapter structure enables volunteers to respond to local flora and conservation issues while participating in a common statewide mission. The society's network extends across California and northwest Baja California; the reference material describes approximately 35 chapters and nearly 10,000 members and volunteers. CNPS's statewide structure includes a state office, board of directors, Chapter Council, and five principal program areas: Conservation, Rare Plant Science, Vegetation Science, Education, and Horticulture. Through these programs, staff and volunteers work with scientists, government officials, public agencies, and regional planners. The society advocates for informed environmental policies and land-management practices, while also producing technical information used in planning and habitat protection. A major part of the society's institutional contribution has been the creation and maintenance of botanical reference systems. The Inventory of Rare and Endangered Plants catalogs California's special-status flora through the California Rare Plant Ranks, formerly known as the CNPS Lists. The inventory is used by scientists, planners, and agency officials when assessing rare-plant occurrences and potential habitat impacts. CNPS also developed A Manual of California Vegetation and its online database, which provide a framework for identifying and describing plant communities and are used by state and federal agencies in vegetation and habitat management. The Rare Plant Treasure Hunt expanded CNPS's field-based conservation role. Staff and volunteers revisited populations of rare, threatened, and endangered plants and updated records in the California Rare Plant Ranks and the California Department of Fish and Wildlife's California Natural Diversity Database. Between the 2010 and 2014 seasons, the project updated more than 2,500 occurrences, with over 1,000 reported as new to science in the reference material. The related Rare Plant Seed Rescue Project added an ex situ conservation dimension by seeking seed and tissue collections from rare-plant populations for long-term storage and protection against extinction. Public education and horticulture have remained central to CNPS activities. The society promotes native plants as choices adapted to local climate and soils and communicates their potential to reduce irrigation, fertilizer, soil-amendment, and pesticide requirements. In 2010, California Native Plant Week was established during the third week of April each year. The society also conducts regular educational events and maintains publications for both specialist and general audiences. In 2016, CNPS launched Calscape, a digital database connecting users with information about native plants, pollinators, and local nurseries. The platform allows searches by plant and location, supports plant-pollinator comparisons, and provides tools for building personal plant lists. Its sources include botanical databases, reference works, and nursery information. CNPS publishes books, posters, newsletters, bulletins, and the journal Artemisia, formerly titled Fremontia. It organizes an annual conservation symposium and a larger conservation conference every three years. Through these activities, the society has evolved from a 1960s preservation initiative into a broad conservation institution combining scientific documentation, habitat advocacy, volunteer fieldwork, public education, and applied native-plant horticulture.

• 2016

  Calscape launched

  [1]California Native Plant Societyen.wikipedia.org

  CNPS introduced Calscape, an online search and planning resource for California native plants, pollinators, and nurseries.

• 2014

  First five-season Rare Plant Treasure Hunt results reported

  [1]California Native Plant Societyen.wikipedia.org

  The 2010–2014 seasons produced more than 2,500 updated occurrences, including more than 1,000 described in the reference material as new to science.

• 2010

  California Native Plant Week designated

  [1]California Native Plant Societyen.wikipedia.org

  The state legislature designated the third week of April as California Native Plant Week, recognizing the ecological and horticultural value of native species.

• 2010

  Rare Plant Treasure Hunt reporting period begins

  [1]California Native Plant Societyen.wikipedia.org

  The Rare Plant Treasure Hunt began a five-season period of field surveys and record updates covering rare, threatened, and endangered plant occurrences.

• 1965

  California Native Plant Society founded

  [1]California Native Plant Societyen.wikipedia.org

  Professional botanists and grassroots activists established CNPS after helping preserve a native plant garden in Tilden Regional Park in Berkeley.

A statewide, science-informed grassroots conservation society linking native-plant research, habitat protection, public education, policy advocacy, restoration, and climate-appropriate horticulture.

• Scientific database

  Inventory of Rare and Endangered Plants

  CNPS's online inventory records California's rare and otherwise special-status plants through the California Rare Plant Ranks. The resource supports botanical research, environmental review, land-use planning, and agency decision-making by organizing information about rare-plant status and known occurrences.

• Vegetation science reference

  A Manual of California Vegetation

  A reference work and online database for identifying and describing California vegetation communities. It is used by conservation practitioners and state and federal agencies to characterize vegetation, assess habitat, and inform management and planning.

• Digital horticulture and conservation platform · 2016

  Calscape

  Calscape is a searchable online resource for California native plants, local pollinators, and nurseries. Users can search by plant or location, examine plant-pollinator relationships, locate potential sources, and save personal plant lists for gardening or restoration planning.

• Botanical journal

  Artemisia

  CNPS's journal, formerly titled Fremontia, covers botany, native-plant horticulture, vegetation science, land management, society projects, and related conservation topics. It is published three times a year according to the reference material.

• Field conservation program · 2010

  Rare Plant Treasure Hunt

  This volunteer- and staff-supported program surveys populations of rare, threatened, and endangered plants and improves occurrence records used by conservation scientists and public agencies. Its reported early results included thousands of updated records and many occurrences considered new to science.

• Ex situ conservation program

  Rare Plant Seed Rescue Project

  An offshoot of the Rare Plant Treasure Hunt focused on collecting seeds and tissue from rare-plant populations and placing material in long-term storage facilities to provide an additional safeguard against future extinction.

• 2016Calscape

  California

  CNPS introduced a public digital platform to make native-plant selection, pollinator information, and nursery discovery more accessible to gardeners, educators, and restoration practitioners.

  Outcome. Calscape became a searchable information resource connecting plant identity and location data with horticultural and conservation use.

  Source
• 2010California Native Plant Week

  California

  CNPS supported the effort that led California's legislature to designate the third week of April each year for public recognition and promotion of native plants.

  Outcome. The designation created a recurring statewide observance emphasizing native plants' ecological suitability and lower resource requirements in appropriate landscapes.

  Source
• 2010Rare Plant Treasure Hunt

  California

  CNPS organized field surveys with volunteers and staff to locate, revisit, and document rare, threatened, and endangered plant populations.

  Outcome. During the first five seasons, more than 2,500 occurrences were updated and more than 1,000 were reported as new to science in the reference material.

  Source

• 2016

  Launch of CalscapeProduct launch

  Background

  Public access to reliable information about locally appropriate native plants, pollinators, and nurseries was a practical extension of CNPS's education and horticulture mission.

  Action taken

  CNPS launched Calscape as an online database and search platform organized around plants, locations, pollinators, and nursery availability.

  Aftermath

  The platform provided users with a digital tool for native-plant gardening, habitat restoration, and local plant selection.

  Source

1. 1California Native Plant Societyen.wikipedia.org