Philadelphia Flower Show - largest and longest‑running indoor flower show

The Philadelphia Flower Show, produced by the Pennsylvania Horticultural Society and held annually at the Pennsylvania Convention Center, is widely described as the world’s largest and longest‑running indoor flower show with origins dating to 1829. The event features large themed displays, competitive horticultural exhibits, and attracts hundreds of thousands of visitors each year. The show moved to the Convention Center in 1996 to accommodate larger exhibits and attendance.