Which Grand Cru vineyard is known strictly for producing white grapes?

The Grand Cru vineyard known strictly for producing white grapes is Corton Charlemagne. This vineyard is located in the Burgundy region of France and is renowned for its exceptional white wines made from Chardonnay grapes. The terroir of Corton Charlemagne provides the ideal conditions for Chardonnay cultivation, resulting in wines that are highly regarded for their complexity and quality.

Chablis Grand Cru does produce only white wines, primarily from Chardonnay as well, but the question seeks a vineyard specifically known for being restricted to white grapes, which Corton Charlemagne is particularly noted for, especially in the context of high-quality production.

Alsace Grand Cru encompasses a variety of vineyards producing both white and some red wines, so while many Alsace Grand Cru sites specialize in white grape varieties, it's not exclusively white.

Montrachet, much like Corton Charlemagne, is famous for its white wines made from Chardonnay; however, it is closely associated with the Montrachet vineyard only rather than a larger appellation style like Corton Charlemagne which encapsulates a broader prestige in its classification. Thus, the distinction of Corton Charlemagne strictly pertains to its establishment in producing only white grapes at a Grand Cru level.