"Put on your botanist hat at Holden Arboretum, where you can walk around manicured gardens of trees, shrubs, and flowers. A member of the American Association of Museums, it truly is a museum of plants, with more than 120,000 species documented. Add to the 600 cultivated acres another 3,000 acres of natural areas, and there's plenty of space to stretch your legs on 20 miles of trails. Be sure to include trails in the arboretum area on your hike, where you will find flowering plants throughout the growing season.
Start your visit to Holden Arboretum at the Warren H. Corning Visitor Center, home to the museum store, nature exhibits, a library, and an information desk staffed with knowledgeable people. Pick up a visitor guide and trail map, which includes a chart of peak viewing seasons for different trails and garden collections. Right behind the visitor center, check out the Arlene and Arthur S. Holden Jr. Butterfly Garden."