Explore the Dark Forest (Native Plant Garden & Trail) during Professor Sprout's Muggle World Herbology Walk, held the third Sunday of the month - May 19, June 16, July 21 & Aug. 18 - at 10 a.m. at Oak Grove Regional Park's Nature Center. Learn about magical properties of native plants and how some are related to the Muggle World during this 45-min., family-friendly walk. Free event, no reservation required. $6 cash parking fee, no pets, please.