Orchid Conservation

Threats like climate change, invasive species, and habitat loss have led to the decline of orchid populations around the world, including in our own southeast Pennsylvania region. These pressures have severely impacted many orchid species, raising concerns about the overall health of our ecosystems. That is why orchid conservation is an area in which we put forth considerable effort and expertise. We are researching, discovering, and refining the horticultural requirements for orchids—with a focus on ensuring native species—and the ecosystems in which they live—continue to thrive.

We work across Pennsylvania and the mid-Atlantic with the goal of impacting the 70+ orchids species in the region, challenging the belief that it is nearly impossible to propagate native US orchids. As a starting point for this program, three different genera have been chosen: Kentucky lady’s slipper (Cypripedium kentuckiense), fringed orchids (Platanthera), and Ladies’-tresses (Spiranthes). Each group is rare for different reasons, presents unique propagation challenges, and flowers during different seasons.

Our conservation efforts are multi-faceted, combining fieldwork, laboratory research, and horticultural practices. We actively scout for orchids in the wild, collect seeds, and continue to grow and develop our orchid seed and fungal bank.  Our research goal is to understand the germination requirements of orchid seeds and develop methods for cultivating orchids in our Gardens and beyond. This knowledge can then be shared and applied to other plant conservation efforts.

Orchid Conservation Spotlight: Southern Lady Slipper Orchid

Four lady slipper orchids with yellow blooms.
The globally rare Kentucky lady’s slipper (Cypripedium kentuckiense) can be found in our Hillside Garden and Peirce’s Woods, and flowers in late May.

After years of study and testing, we have perfected techniques to grow one of the rarest native orchids in the United States, the globally vulnerable Kentucky lady’s slipper (Cypripedium kentuckiense). Our team has been able to successfully propagate, grow, and plant this rare species in our Gardens for guests to enjoy—and even more importantly, plant them in the wild to bolster threatened populations and add new populations.

This is just one example of how we are applying our scientific expertise to orchid conservation from a regional to global scale, working with partners around the world to assess rare orchid populations and to help develop conservation plans for them.

A black and white photo taken in 1967 of blooming orchids in pots in Longwood's historic Orchid House.

Our Historic Orchid Collection

We are home to one of the largest orchid collections in the world. What began with founders Pierre S. and Alice du Pont’s interest in this varied family of plants has blossomed in the decades since, representing our standards of excellence and beauty, as well as upholding our founders’ legacy of innovation and conservation at Longwood.

Orchid Conservation Spotlight: Terrestrial Orchids of Tanzania

Five men in jackets and hats stand in front of a sign for Hifadhi Ya Taifa Kitulo National Park.
“Team Orchid” at the Kitulo National Park in southwestern Tanzania. From left to right: Robert Sikawa (Tanzania Sansevieria Foundation), Fabian Myunga (Ranger at Kitulo National Park), Barry Yinger (TSF), Peter Zale (Longwood Gardens), Dr. Neduvoto Mollel (Tanzania Plant Health and Pesticides Authority).

One of our most exciting projects currently underway involves saving threatened terrestrial orchids in the southern highlands of Tanzania. The ancient, montane grasslands of tropical east Africa contain large concentrations of unique terrestrial orchids that are the subject of poaching.  The potato-like tuber of these orchids are used to make Chikanda—a former staple food in Zambia that has also become popular in neighboring countries including Malawi and Tanzania, putting huge demand on orchids in the wild.

We are using techniques we developed to propagate US native orchids, like Kentucky lady's slipper, to understand how to propagate Tanzanian orchids with the goal of inspiring orchid farming in the regions where these orchids grow, thereby relieving pressure on them in the wild, reintroducing them to native habitats and to gardens around the world.

A vibrant orchid blooms in colors of pink, purple, white, and yellow.

Experience Our Reimagined Orchid House

Our Orchid House provides an immersive orchid-viewing experience like never before. Hundreds of orchids lovingly displayed in custom frame trellises and our restored bronze case dazzle and delight, showcasing the beauty and diversity of our renowned orchid collection. With our curated orchids hand-selected five times per week for rotating display, there’s always something new—and something breathtakingly beautiful—to see.

Watch Now: Plant Exploration in Tanzania 

Embark on a botanical journey through tropical Tanzania with Dr. Peter Zale, our Associate Director of Conservation Horticulture and Plant Breeding. Discover the invaluable role of plant exploration in shaping displays at Longwood, driving groundbreaking scientific research, and fostering global plant conservation initiatives.