This preserve protects a unique dolomite-limestone glade and barrens system, now rare in Kentucky. Kentucky gladecress (Leavenworthia exigua var. laciniata), a state endangered and federally threatened species, occurs at the preserve. It is endemic to Bullitt and Jefferson counties, growing nowhere else in the world. The gladecress was first protected under a 23-acre conservation easement on June 27, 2003. An additional 37 acres were purchased and dedicated as Apple Valley Glades State Nature Preserve on June 14, 2012. The small rocky glade openings scattered among cedar and oak woodlands contain other rare plant species, including Crawe’s sedge (Carex crawei) and Ringseed rush (Juncus filipendulus). Access is by written permission only.