Garden Soil

Garden soil starts as screened topsoil, the native upper soil layer with rocks, clumps, and debris removed, and it is then blended with compost to raise its organic matter and nutrient content. The common target is around a 70/30 split of topsoil to compost, though ratios vary by supplier and by the intended use, with richer blends for vegetable beds and slightly leaner blends for general planting areas. Screening keeps the texture fine and workable, which is why garden soil handles more like a growing medium than raw dirt. Color is a rough indicator of quality here, since darker, near-black tones usually mean more organic content, while lighter, sandier, or clay-toned material suggests more raw topsoil and less compost. Because the compost fraction is active organic matter, not inert filler, garden soil will continue to break down and settle after it's placed, which is expected and different from how a mineral-only topsoil behaves.

For raised beds, remove sod or weeds from the base, loosen the exposed ground a few inches so roots and drainage can connect through to native soil, and consider a layer of cardboard only if weed suppression is the goal, since it will break down over time. Fill to account for settling, planning depth about 10 to 15 percent deeper than the final target so the bed doesn't need a top off within weeks. For in-ground gardens, till or fork the existing soil before adding garden soil on top so the two layers blend rather than sitting as separate strata, which is where drainage problems start. Avoid working garden soil while it's saturated, since wet handling accelerates compaction. Once placed, keep foot traffic off the bed, using boards or defined paths, since compaction from walking reduces the pore space roots and water depend on.

Compared with topsoil. Topsoil is the raw native upper soil layer, mostly mineral with whatever organic content it naturally has. Garden soil is topsoil with compost blended in for higher fertility. Topsoil is cheaper and holds grade more predictably, while garden soil is richer for planting but settles more as its organic content breaks down.

Compared with compost. Compost is fully decomposed organic matter used as an amendment, not a standalone fill. It gets mixed into existing soil rather than used to build bed depth on its own. Garden soil, by contrast, is meant to be used directly as the primary growing medium in beds and gardens.

How much garden soil do I need. Estimate cubic yards with length in feet times width in feet times depth in inches, divided by 324. A 10x20 ft raised bed at 12 in. deep needs roughly 7.4 cubic yards. A 500 sq ft bed at 4 in. deep needs about 6.17 cubic yards. Add about 10 to 15 percent extra to cover settling over the first season, since a 2 to 4 in. drop in depth is normal.

How garden soil is sold and delivered. Bulk garden soil is sold and delivered by the cubic yard rather than by the bag, which is far more economical for beds, gardens, and larger planters than bagged mixes. Since weight per yard varies with moisture, from about 1,500 to 3,000 lbs, orders are typically quoted and scheduled by volume, with delivery dropped at a driveway or curb location for the buyer to move into place.