Topsoil vs Garden Soil: Which One Do You Need?

Topsoil is just the natural upper layer of soil — it varies in quality and composition by source, and is typically used in bulk for grading, filling low spots, or as a base layer under a raised bed.

Garden soil (sometimes called planting mix) is topsoil blended with compost, aged organic matter, and sometimes fertilizer, formulated specifically to support plant growth. It costs more per cubic yard but needs far less amending before you plant.

For bulk fill or a base layer, use the Topsoil Calculator; for the top planting layer in a raised bed, the same volume math applies — just budget for garden soil's higher per-yard cost.

A common raised-bed recipe blends roughly equal parts topsoil, compost, and a coarse material like perlite or vermiculite for drainage. Straight topsoil alone tends to compact too densely for good root growth in a contained bed.