I have to go water a lily

Put away that fish emulsion, says gardening writer Carol Steinfeld. Valuable, nitrogen-rich fertilizer is as close as your bladder.

Every day, we urinate nutrients that can fertilize plants that could be used for beautiful landscapes, food, fuel, and fiber. Instead, these nutrients are flushed away, either to be treated at high cost or discharged to waters where they overfertilize and choke off aquatic life.

Information about her book, Liquid Gold and photos of urine-fertilized gardens are on her website.