The Perennial Collection was established in 1982 and is one of the most colorful places on the Iowa Arboretum grounds during the summer months. Since many perennials are grown for their flowers, this collection highlights plants with different bloom times or exceptionally long periods of bloom. Both native and introduced species and their cultivars are displayed. The central border was redesigned in 2008 by Ann Hutchins of Des Moines to include newer perennials and a variety of unusual ornamental grasses recently introduced into commerce.