PHILADELPHIA FLOWER SHOW is the largest indoor flower show in America. The Philadelphia Flower Show 2011 takes place from March 6-13, 2011. The show is produced by the Pennsylvania Horticultural Society and features the country's premier landscape designers and florists who turn 10 acres of the Philadelphia Convention Center into a floral fantasy world with exotic plants and eclectic designs. The theme for the 2011 show is "Springtime in Paris." In addition to the major garden displays, the show features competitions in horticulture and artistic arranging, gardening lectures and demonstrations, special events, an indoor Marketplace, and a city-wide Flower Show Week celebration throughout downtown Philadelphia. More Info.