Passionvine, Pearl Milkweed and Pigeonberry are just three of the multitude of plants growing among ancient, towering oaks in this remnant urban forest, one of San Antonio’s critical ecological resources. This walk is an exploration of the plants and vital, complex ecology of the bottomland woods along the Great Oak Trail. Donald Ewers, vice president of Alamo Area Chapter of the Texas Master Naturalists, will be guiding participants on this walk based on his background in botany, ethnobotany, urban green space ecology, and forty-four years experience exploring what has become the Headwaters Sanctuary. The program is limited to 12. The walk will commence at the Main Sanctuary trailhead.