Improving Soil in an Established Perennial Garden

Debbie's plants yellow and die prematurely. The expert shares a "Super Soil Mixture" for existing beds: turn soil around plants and work in composted manure, leaves, pine needles, grass clippings. For new beds, mix topsoil, manure, compost, sand, Milorganite, cedar mulch, gypsum (if clay), and sulfur. Use Preen or corn gluten for weed prevention.