Which white wine producer is known for its Riesling with residual sugar of 18?

The producer known for its Riesling with a specific residual sugar level of 18 is Sperling. This winery is recognized for creating wines that balance sweetness with acidity, making it a significant player in the production of higher residual sugar Rieslings. Their winemaking philosophy emphasizes terroir and the expression of the grape, allowing the inherent characteristics of the Riesling variety to shine through with a touch of sweetness.

In contrast, the other wineries mentioned tend to focus on a range of different styles, such as drier wines or other varietals, which may not specifically highlight a Riesling with that level of residual sugar. Therefore, Sperling stands out due to its commitment to producing a Riesling at 18 grams of residual sugar, aligning with its identity as a memorable and distinctive white wine producer.