Thackrey is uncertain what grape varieties are in the field blend, as UC Davis researchers have attempted a vineyard test without certain conclusions. "The experimental nonvintage blend Pleiades (Sean Thackrey Pleiades California Red Table Wine) was first released in 1992. Made from a host of different grape varieties (potentially both white and red, such as Syrah, Barbera, Zinfandel, Carignan, Pinot noir, Mourvedre and Grenache), potentially from different regions and different vintages. The recipe changes every year, depending on the decisions of Thackrey and the fruit sourced. Thackrey has said, "It's like a chef's special. You trust the chef so you're prepared to order the dish of the day".