Dunham Cellars, in partnership with Trey Marie Vineyards LLC, has made an extensive commitment to planting and managing our own vineyard sources. Appellation Management Group, a subsidiary of Trey Marie Vineyards LLC, is a vineyard management company that currently manages over 100 acres in the Walla Walla Valley from several different sites. Each site is unique in its own way. The boxes below describe the profile of each site's terroir.