The National Virtual Arboretum and Regional Ornamental Plant Database is a collaborative effort of numerous regional and national horticulture professionals and organizations. Plants on this database have been selected for their excellent performance and years of service. Promoting diversity in the landscape gives gardeners, landscapers and plant propagators / nurserymen the opportunity to expand with a wider variety and selection of outstanding plants and helps to alleviate monotonous monocultures both aesthetically and disease-wise.