Gary's landscape sits at the edge of Lake Michigan's southern shoreline, where glacial activity left behind the sandy loam soils that define this stretch of northwest Indiana. The Grand Calumet River winds through the industrial corridor, and neighborhoods near Marquette Park deal with wind-exposed terrain that dries out planting beds faster than gardeners expect. With 40 inches of annual rainfall spread unevenly across the seasons, organic mulch breaks down quickly in summer heat and needs regular replenishment. Homeowners from Hammond to Merrillville share these same Calumet Region soil challenges, making quality mulch and amended topsoil essential for building beds that hold moisture and nutrients through Zone 6a winters and hot Midwest summers.