Is Landscape Mix, Topsoil, Potting Soil, and Garden Soil all the same?

No, soils are sourced and blended differently by manufacturers and suppliers.  Typically, topsoil is soil excavated and sold directly as “good dirt” (this is not the case with RSI’s Topsoil).  Potting Soil contains a mixture of perlite, dolomite, peat, or other materials best-suited for potted plants.  It is light and drains rapidly.  Garden Soil can refer to a material that is very similar to Topsoil or Landscape Mix.  Landscape Mix often has a higher percentage of organic material and sand to promote adequate drainage along with moisture and nutrient retention.  Landscape Mix is better suited for planting established plants while topsoil is better for gardening and seeding/sodding a lawn.