Placerville sits at 1,867 feet where the Sierra foothills start to climb, and almost every yard here is built on decomposed granite that drains fast in July and turns to slick, gritty runoff during the 40 inches of rain that arrive between November and March. Lots off Cedar Ravine and above Hangtown Creek tend to slope hard, so gardeners near the Hangman's Tree site downtown and out toward Diamond Springs need mulch that locks together instead of floating away. Higher up in Pollock Pines the pines drop needles all year, while yards in Auburn and Jackson bake harder in late summer. Zone 9b heat, granite subsoil, and steep ground mean bulk compost, screened topsoil, and angular stone all earn their keep here.