Cold climate, steep hills and warm slate
This far north, the vines require average annual temperatures of 9 to 13° C, and 1,100 to 1,600 hours of sun during the vegetative period. The steep vineyards (up to 60°) stand at a perfect angle to the sun, allowing the dark slate to heat up more quickly. The river itself stores the warmth while reflecting the sunlight. The cold air from the Eifel and Hunsrück mountains flows into the valleys at night and cools the grapes. This helps preserve the acidity that lends the wines their elegance. The morning fog leaves dew on the grapes and promotes the growth of Botrytis, the noble rot that serves as the basis for successful nobly sweet rarities.