Westerville, Ohio. Nestled within a scenic nature preserve, the 121-acre Inniswood Metro Gardens is a source of inspiration for all ages. Streams and woodlands filled with wildflowers and wildlife provide a majestic backdrop to the beautifully landscaped areas. Inniswood boasts more than 2,000 species of plants, specialty collections and several theme gardens. You can support Inniswood Metro Gardens by becoming a member of the Inniswood Garden Society.