In 1881 show entertainment included Bon Bon the tightrope walker. His tightrope was 150ft long and 40ft above the ground. Bon Bon carried a live bear cub on his shoulders across the rope and settled down to cook an omelette halfway across.
In 1924 the Shropshire Horticultural Society bought Shrewsbury Castle for £2,621 from show profits and presented it to the town.
The site of the show was used as an allotment to grow food during the Second World War.
A flypast from Concorde celebrated the show's centenary in 1987.
Katherine Jenkins performed in 2004.
The world record for the largest display of potato varieties was clinched at the show in 2004 when 589 varieties were on display.
There are around 400 exhibitors at the show every year.
More than three million flowers are brought into the town's Quarry Park every summer.
50,000 visitors are expected at the 125th show today and tomorrow.
In 2007, Princess Alexandra, the Queen's first cousin, became the president of the Shropshire Horticultural Society and was the figure head for that year's event.