Carbonized remains of sweet potato recovered from caves in the Chilca Canyon of south-central coastal Peru represent some of the earliest evidence of this tuber's use by humans. Radiocarbon dating of specimens from the Tres Ventanas cave yielded dates of approximately 8080 BCE. Whether these remains reflect wild harvesting or deliberate cultivation at this early date remains debated, as clear evidence of systematic sweet potato farming in Peru appears millennia later, around 2500-750 BCE.