In Robert Kourik’s garden is a green, lush bed of foxglove and lavender and other lovelies that haven’t been irrigated for 20 years. He started the bed on drip irrigation for three years, but then weaned it off water. It’s that kind of garden magic that the practical Kourik is known for in plant circles – that and being the “graywater guru” and root expert. Kourik, nationally recognized author and sustainable landscape designer, is giving a free presentation on "Roots Demyst