Hallertau Mittelfrüh is an aroma hop that is typically used in only late boil additions, including dry hopping but is also often used as a single hop in German Pilsners, Helles, etc.
Hallertau Mittelfrüh - or "Hall Mitt" - hops have a specific aroma descriptors include mild, yet spicy, with floral and citrus tones. Although it can be and is used throughout the boil, it is most prized for its fine, elegant aroma and flavor contribution. Mittelfrüh is, at least to some, the epitome of noble hops.