text:  There is demand for one thing. Also, though, input costs for organic farmers are just higher. They can't use most synthetic fertilizers, herbicides and pesticides. And so instead, they have to rely on other methods, including more labor. Marketplace's Stephanie Hughes went down to the farm. When David Palk passes a weed on his farm, it's hard for him not to pull it out. That's amaranth. This one we don't like.