I have a great product that will help a lot of people. How do I get it in the hands of Walmart and Lowes?

I currently sell special fertilizers to golf courses that have eliminated disease and the need to water excessively. These products work well on vegetables for the home owner and can extend the shelf live of vegetables grown with them. They can also make the vegetables more nutritious and everything is biologically safe. How can I get Walmart or Lowes to put them on their shelves?