Zubróvka is not a brand but rather a category of vodka flavored with Bison Grass, the herb that bison feed on.

Grasovka is a Premium Vodka in the Zubróvka category. Produced in Poland, Grasovka is a 100% natural vodka! The bison grass used to flavor it grows on the Polish plain on the border with forests that are part of the Bialowieza national park.