Protecting Kentucky’s Endangered Glade Cress: A Community Effort

Kentucky glade cress (Leavenworthia exigua laciniata) is a rare and threatened plant found only in Jefferson and Bullitt counties in Kentucky and nowhere else on Earth.

This delicate species thrives in specific environments with thin soils over limestone, such as limestone or cedar glades. Unfortunately, the rapid development in Jefferson County, one of Kentucky’s fastest-growing areas, poses a significant threat to its survival. The glade cress’s very specific habitat requirements and limited range, combined with the pressure from urban expansion, hinder recovery efforts. Habitat fragmentation and the resulting loss of genetic diversity are primary concerns for this unique plant.

Through our ongoing work on the McNeely Lake Park Access Trail, our team was brought into collaboration with the Louisville/Jefferson County Metropolitan Government (Louisville Metro). Louisville Metro manages several glades within the park to support Kentucky glade cress through habitat management, including burning and seeding from other populations. Louisville Metro contacted us about collecting seeds from a known threatened population located at a nearby development site.

Our team of ecologists coordinated access to the collection site with the developer. They also ensured compliance with the Endangered Species Act by working closely with the U.S. Fish and Wildlife Service (USFWS). After a month of meticulous planning, our team of ecologists and botanists met with representatives from Metro, the USFWS, and the Office of Kentucky Nature Preserves at the development site to collect seedpods. These seedpods were harvested from glade areas slated for development in the coming year. This proactive measure allowed us to preserve the genetic diversity of this population before it could be impacted.

The collected seeds will be prepared for planting and dispersed later this year to bolster several other populations of Kentucky glade cress. This collaborative effort highlights the importance of community and government partnerships in protecting and conserving our precious natural heritage. We are working to ensure that the Kentucky Glade Cress continues to thrive for future generations.