45-acre botanical museum, New England's premier native plants showcase. Discover over 1,000 species in naturalistic displays, including the unique NE Garden of Rare and Endangered Plants. Invasive Plants Jail. Group tours, cart tours, children's tours. Open Tues-Sun, April 15-October 31. Guided walking tours daily. An ever-changing tapestry of flowers and foliage...spring, summer, and fall. Eco-friendly garden shop, native plant nursery, snacks, picnic area. 20 miles west of Boston.