They grow in the Northern Hemisphere in eastern Asia ( mostly northern China , Korea , and eastern Siberia ) , typically in cooler climates ; Panax vietnamensis , discovered in Vietnam , is the southernmost ginseng found . It grows in the Northern Hemisphere in eastern Asia ( mostly northern China , Korea , and eastern Siberia ) , typically in cooler climates ; Panax vietnamensis , discovered in Vietnam , is the southernmost ginseng found .