Wapato tubers were a dietary staple among the indigenous people of the Fraser and Columbia rivers — the garden site is in what is now the Katzie First Nation territory
The History Blog
The tubers were wild plants, not domesticated, and wapato plants can grow deep underground all on their own. It’s an assemblage of rocks that makes it clear that this site wasn’t just a very prolific wild potato patch, but a cultivated wetland garden ingeniously customized by the indigenous people of the area to enhance harvest yields.
The key evidence of cultivation is the rock pavement which is too uniform and densely packed to have been the result of natural processes like water carrying small stones to the lowest lying land. Archaeologists also found fragments of 150 fire-hardened wood tools, some still embedded in the rock pavement, used to harvest the tubers en masse.