"Auch Wasser wird zum edlen Tropfen, mischt man es mit Malz und Hopfen"

The beer garden culture goes back to the 16th century.  In 1553 it was forbidden to brew beer during summer because the brewers' yeast needs between 39 and 46 Fahrenheit to produce the fermentation. And since the refrigerator wasn't invented yet, the brewers could only brew their beers between the catholic St. Michael's day on September 29 and St. George's day on April 23. The beer was stored during the warmer summer months in underground beer cellars (bierkellers) that served as a chilled warehouse. The storage was called "lagern" in German. Above the cellars were chestnut trees, and the soil was graveled. It ensured that the sun didn't warm up the cellars. People used to enjoy their Lager beer around the beer cellars in the shadow of the trees. Soon tables and benches were set up, the beer garden was born. Today, chestnut trees can be found in every Bavarian beer garden. The Bavarian government emphasized in the beer garden ordinance of 1999 the importance of the beer garden culture for the society as a special place in which social differences play no role. However, this doesn't mean that manners play no role. Your manners are pretty important during a visit to the beer garden. What started in the region of Munich as a typical Bavarian cultural element developed into an appreciated pastime during warm weather, in Germany, and at special locations all around the globe.