Like, they will come down from the trees? This must be hugh!
They had figured out farming well before your ancestors.
"The gardens of the New Guinea highlands are ancient, intensive permacultures, adapted to high population densities, very high rainfalls (as high as 10,000mm/yr (400in/yr)), earthquakes, hilly land, and occasional frost. Complex mulches, crop rotations and tillages are used in rotation on terraces with complex irrigation systems. Western agronomists still do not understand all practices, and native gardeners are notably more successful than most scientific farmers. Some authorities believe that New Guinea gardeners invented crop rotation well before western europeans. "