Gregor Ziegler GmbH is a family-owned company based in Plößberg, Bavaria, with over 35 years of experience in producing high-quality substrates, bark, and fertilizers. The company also manufactures wood-based fuels under the Thermospan brand, including wood pellets and briquettes. It focuses on sustainable practices and continuously improving its product offerings to meet customer needs. The company operates primarily in the northern Upper Palatinate region of Bavaria.