Los Angeles sits in a broad coastal basin where clay loam soils dominate everything from the flatlands of Culver City to the hillside gardens climbing toward Altadena, and that dense soil makeup creates real challenges for water infiltration and root development. With only 16 inches of rain falling each year and no frost dates to work around, the City of Angels runs on a near year-round growing calendar that demands landscapes stay nourished and protected through long, dry stretches. Homes tucked into the slopes above Silver Lake and along the canyon edges near Calabasas see erosion pressure every time those rains finally arrive, making proper stone and mulch coverage a genuine necessity rather than an aesthetic choice. Bulk organic mulch helps break up surface clay and slowly builds the organic matter that native and drought-adapted plantings depend on, while decomposed granite and river rock give sloped beds the stability they need between wet seasons. From the canyon communities to the coastal flats near Manhattan Beach, Los Angeles landscapes reward thoughtful material choices made with the local soil and sun in mind.