The PHS Philadelphia Flower Show is both the nation's largest and the world’s longest-running horticultural event, featuring stunning displays by premier floral and landscape designers from around the globe. Started in 1829 by the Pennsylvania Horticultural Society, the Show introduces diverse and sustainable plant varieties and garden and design concepts. In addition to acres of garden displays, the Flower Show hosts esteemed competitions in horticulture and artistic floral arranging, gardening presentations and demonstrations, and special events.

The Philadelphia Flower Show has been honored as the best overall event in the world by the International Festivals & Events Association, competing with events such as the Kentucky Derby Festival, Tournament of Roses Parade, Indianapolis 500 Festival, and other international celebrations.