Driving through Gold Rush country, Cantisano points out a 120-year-old pear tree standing tall between a community hall and a gas station.
"It's thrown [sic] huge crops every year in the drought. It doesn't get diseases, it doesn't get insects. Nobody prunes it, nobody waters it, nobody fertilizes it, and it is just prolific as heck. I've picked over 500 pounds of pears off of it," he says.
He says these resilient heirloom trees have lessons for today's California growers, where highly tended crops face drought, pests and disease.
"If we can figure out how to take those characteristics and meld them into modern agriculture, we're going to have a more sustainable agriculture," he says.