For over two centuries, Historic Congressional Cemetery has stood as a serene and storied sanctuary on Capitol Hill. The 35-acre urban green space weaves together history, nature, and culture, offering visitors a unique opportunity to connect with the nation’s past while enjoying its tranquil beauty. The cemetery’s role as a steward of nature is expanding with its conservation initiative to become an ‘Accredited Arboretum’.
In 2024, Congressional Cemetery began a new community collaboration in environmental stewardship. With the support of a Partners for Plants (P4P) grant awarded by the Garden Club of America and Trowel Garden Club, the cemetery launched a three-year partnership to enhance its arboreal landscape. Working closely with Casey Trees, this undertaking will serve to strengthen the cemetery’s tree-focused conservation program within the memorial park.
Arboretum
Historic Congressional Cemetery is advancing its role as both a historic burial ground and an urban greenspace through the development of a formal arboretum initiative that unites preservation, education, and environmental stewardship. The cornerstone of this effort is the pursuit of Level I Arboretum Accreditation through ArbNet, reflecting an ongoing commitment to tree conservation, public engagement, and thoughtful landscape management. From old-growth witness trees that have stood beside gravesites for generations to more than 500 trees planted in partnership with Casey Trees over the past two decades, the cemetery’s canopy represents a dynamic blend of history, renewal, and ecological resilience.
As part of this initiative, the cemetery has created a digital Arboretum Database to complement the Tree Walk tour, offering a living catalog of the trees that shape the landscape. Through species identification, tagging, and accessible online records, the database invites visitors to explore the grounds through the lens of urban forestry while deepening their understanding of biodiversity, conservation, and the evolving natural history of this nationally significant site.
Tree Walk Through History
A key feature of the arboretum project is the newly launched ‘Tree Walk Through History’ – a quarter-mile arboreal path showcasing significant memorial sites while highlighting the cemetery’s tree diversity. The trail weaves through picturesque tree tunnels, or bordering allées formed by the tree branches by American hornbeam, Kwanzan cherry, and Chinese elm trees, among others.
The signature tree walk honors the cemetery’s historical legacy while promoting biodiversity and environmental sustainability. Plans for the arboretum include labeling two dozen distinct species of trees with their botanical and common names for visitors to identify and enjoy.
Among the highlights of the tour is the Circle of Life, an outdoor contemplative gathering space surrounded by a circular “tree-henge” of eight American linden trees (also known as basswoods) planted in 2020. Each young tree is aligned with a navigational point on the central compass sundial. As they mature, their respective tree shadows across the compass will mark the changing seasons and the sun’s celestial path during solstices and equinoxes. This living ‘tree-henge’ is a tribute to nature’s perseverance and the ebb and flow of time that gives way to another day, and another season.
Tree Walk Celebration
Video provided by Kayla Diaz
To mark Arbor Day Weekend 2025, Congressional hosted a ‘Tree Walk Through History’ parade and spring tree planting event on Sunday, April 27, from 5pm to 7pm. The celebration featured a rousing drumming performance by Batalá, Washington’s all-female percussion band. Playing their Afro-Brazilian Samba-Reggae rhythms, Batalá led revelers in a spirited 2nd line procession, weaving through the arboretum’s canopy tree tunnels and totem pole arch, and ultimately gathering at the Circle of Life for remarks from cemetery leadership.
Check our events calendar for future upcoming events! All are welcome to participate.
