What If There Weren’t Any Trees?

Saturday, Nov 11, 11 a.m.–12:30 p.m.
Meet at Main Post flagpole (near Moraga Ave. & Graham), Presidio
Learn about the various trees that shape the Presidio and how they got there on this short hike on the Ecology Trail. Reservations required. Free, 415-561-4323, www.parksconservancy.org