André Ostertag is clearly one of the most dynamic producers in Alsace today, and certainly one the highest rated.
Biodynamism was extended to 100% of the domaine in 1998, precluding any use of herbicides, chemical fertilisers and insecticides. All viticultural work is done manually, including harvest. In the cellar, press cycles are long and gentle, fermentations are long and conducted without artificial yeasts, and wines are left on their lees. Barrels are used for Pinot Blanc, Gris (sometimes) and Pinot Noir. There is little or no filtration of any of the wines, which rank among the finest in all of Alsace today.