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Plant Collections Network

High Elevation Palms

San Francisco Botanical Garden's Arecaeae (Palm Family) Collection has achieved Plant Collections Network (formerly NAPCC) Accreditation. The Bay Area’s mild Mediterranean climate with coastal fog is the ideal environment for growing high-elevation palm species outdoors. These conditions enable successful cultivation of rare, heat-intolerant species from cloud forest habitats in the Andes and Temperate Asia, a significant contribution to ex situ conservation initiatives.   


The U.S. National Arboretum’s National Boxwood Collection is one of the most complete collections of boxwood in the world.  There are around 150 different species and cultivars planted in the Arboretum. 


The University of California Botanical Garden has over 500 accessions of 360 taxa of ferns.  About 65% grow in the outdoor collections, and about 84% are of known wild origin, making them particularly valuable research specimens. In 2012, the Garden’s fern collection was recognized as a collection of national significance by the Plant Collections Network (formerly NAPCC). 

Cycad Multisite

The cycad garden at Ganna Walska Lotusland was one of the last to be added by Madame Walska to her 37-acre estate. Over the years she planted a few individual cycads because they reminded her of her favorite plants, the palms. In the early 1970s, however, she decided to collect as many species of cycads available and displayed them in their own corner of the property.

Mojave Desert Cacti and Succulents

The Plant Collections Network (formerly North American Plant Collections Consortium, NAPCC) of the American Public Gardens Association granted accreditation to the Springs Preserve's Cacti and Succulents of the Mojave Desert Collection. The Plant Collections Network accreditation enables the Springs Preserve to make its cacti and succulent collection available for increased distribution and research, while promoting greater public understanding of conservation issues.

Orchids - Tropical Species

The Smithsonian Gardens Orchid Collection (SGOC) has grown from five plants to over 8,000 specimens since 1974. It is an invaluable resource for educational programs, exhibitions, and scientific research.

This collection is maintained in the Smithsonian Gardens Greenhouse Facility in Suitland, Maryland by staff, interns, and volunteers. It received accreditation from the Plant Collections Network (formerly North American Plant Collections Consortium, NAPCC) in January 2014, making it the first member of the Orchidaceae tropical species curatorial group.


The Scott Arboretum holds three Nationally Accredited Plant collections including Ilex (hollies), Quercus (oaks), and Magnolia. Our first collection to get Plant Collections Network (formerly North American Plant Collections Consortium, NAPCC) status was the holly collection.  The lion’s share of this collection is found in the James R. Frorer Holly Collection on the south facing slopes along the Crum Creek. This collection was donated by Swarthmore College graduate, James R. Frorer in 1974 from his property in Wilmington, Delaware.

Mesoamerican Cloud Forest

The San Francisco Botanic Garden was one of the first gardens to commit to holding and developing a collection for the Plant Collections Network (formerly North American Plant Collections Consortium, NAPCC) for their Mesoamerican Cloud Forest. As a holding institution, they protect, propagate and share the listed species. This helps to ensure that no one garden has 'the' only representation of a particular plant species.


The Orchid Collection and Cycad Collection of San Diego Zoo Global have been awarded Plant Collections Network (formerly North American Plant Collections Consortium, NAPCC) accreditation. An early leader in the specialized field of zoo horticulture, San Diego Zoo has developed extensive plant collections. Its significant orchid collection includes over 900 taxa with a strong emphasis on the genus Paphiopedilum. Many acquisitions came from the Zoo’s participation as a CITES plant rescue center, receiving orchids confiscated at United States borders.


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