Reichenau island lettuce is a regional specialty produced under controlled conditions in the region of Baden-Württemberg. The use of fertilizers and pesticides in the production of this type of lettuce is reduced to a minimum. The lettuce is cultivated in an organic medium.
It is grown both outdoors and in protected areas such as glasshouses or polytunnels. Lake Constance, which surrounds the area where it is raised, plays the role of a light reflector and heat sink. When being grown in covered spaces, the positive characteristics of this specialty lettuce are maximized through climate control, irrigation, and optimal nutrients, allowing the first harvests to come very early in the spring.