Support Matthaei Botanical Gardens & Nichols Arboretum with your purchase of antique and heirloom peony varieties just like the ones that grow in the Peony Garden at Nichols Arboretum. Also, live music Saturday, June 4 and guided tours of the garden June 4-10. The 2011 Nichols Arboretum Peony Festival continues through Friday, June 10 with guided and self-guided tours available at the garden entrance throughout the week. Free admission; call ahead for bloom updates and guided tour times.