This style is typical for the country side of Hainaut, a province of Belgium and a department of France. It is a rural area with large grain farms, and these farms all used to brew. The original style of Saison is a blend of 2 or 3 beers, with one of them being an old slightly sour beer.
The farmer was making room in his vessels by dumping old sour beer, and the drinkers were the poorest of all workers. They were people wandering from season to season, from crop to crop, to work.
Today however, the quality of the Saison beers is perfect, but a real Saison should still be a blend of 2 beers. Blending beer is an art, and not all brewers master it. Unfortunately some brewers just give the name Saison to their amber ale.