Yiguo sources premium walnuts from the 37° N latitude region, globally recognized as a premier cultivation zone for high-quality walnuts. Located within the loess hilly terrain at altitudes ranging from 700 to 1300 meters, the region provides over 2000 annual sunshine hours and a frost-free period exceeding 200 days. These optimal natural conditions, defined by abundant solar radiation and significant diurnal temperature swings, ensure a consistent supply of superior raw materials with high nutrient density.