The property that is now Hardberger Park was overgrazed by livestock during its more than 100 years as a working dairy farm. Non-native species such as King Ranch Bluestem and Bermuda Grass have persisted ever since. Woody species such as Texas Persimmon and Ashe juniper trees also crowded out native grasses.
Since 2009, 13 acres of native grasses have been planted near the beginning of the Oak Loop Trail, restoring the land from dairy farm to savanna. Grasses planted and seeded include Big Bluestem, Little Bluestem, Eastern Gama Grass, Indiangrass, Sideoats Grama, Upland Switchgrass, Inland Sea Oats and Texas Cupgrass.
The savanna provides a more diverse habitat and food source for birds and other wildlife. Additional grasslands will be planted along the abutment of the Land Bridge.