You mean the grape Riesling. Riesling has a big range from sweet
to absolutely dry. Somebody says, Riesling is the king of
whitewine.
Very famous are German Riesling sweet wines, harvested very
late, up to January following year. The names are Auslese,
Beerenauslese, Trockenbeerenauslese and Eiswein, that means special
selected grapes up to icewine. High qualities of good years can be
stored lifelong or longer. In "Bremer Ratskeller" Riesling are
stored up to 1727 and this wine is drincable.