Farmhouse ale is best described as an ancient beer style that was brewed by European farmers who used their grains and hops. These brews were made with techniques that are not used in modern brewing, and because they were brewed in various European regions, the examples are incredibly versatile and include a variety of different sub-styles that are usually very region-specific.
Farmhouse ales were made in places where people cultivated grains, and in the early 20th century, it was a prevalent style throughout northern Europe. These beers were a part of everyday life. In some places, they were prepared and enjoyed on special occasions, and in the regions where grains were plentiful, they were enjoyed on a daily basis.
The techniques were also different, and other ingredients such as herbs and spices were often added to the brew. This is why the examples significantly vary, but most were crisp and dry, with a funky and somewhat earthy character. Examples of the style include Bière de garde (France), Saison (Belgium), and Sahti. (Finland).