Compost vs Decomposed Granite: Size, Cost, and Which to Use

Compost

Decomposed organic matter used as a soil amendment to improve soil structure, fertility, and water retention. Quality compost is dark, crumbly, and earthy-smelling. It adds beneficial microorganisms and nutrients that support healthy plant growth and improve poor soils.

Decomposed Granite

Decomposed granite, or DG, is granite that weathered in the ground into a mix of sand, silt, and small chips, then was dug and screened to 1/4 or 3/8 inch minus. It costs $43 to $152 per ton in 2026, weighs 1.3 to 1.5 tons per cubic yard, and compacts into a firm, natural-looking path or patio surface in gold, tan, gray, or rose. It is the standard path material in California, Arizona, Texas, and most of the drought-tolerant West.

Compost

• ✓ Soil amendment
• ✓ Garden beds
• ✓ Lawn top-dressing
• ✓ Raised beds
• ✓ Tree and shrub planting
• ✓ Seed starting mix

Decomposed Granite

• ✓ Walkways
• ✓ Patios
• ✓ Landscaping
• ✓ Driveways
• ✓ Dog runs
• ✓ Bocce courts

Compost

• + Dramatically improves soil structure and fertility
• + Increases water retention in sandy soils
• + Improves drainage in clay soils
• + Adds beneficial microorganisms
• + Reduces need for chemical fertilizers

• − Quality and composition vary widely between sources
• − Can be odorous when fresh
• − May contain weed seeds if not fully composted
• − Too rich for direct planting — must be mixed with soil
• − Settles significantly after application

Decomposed Granite

• + Natural gold and tan look that fits Western landscapes
• + Compacts into a firm, walkable surface
• + $43 to $152 per ton loose, cheap where granite is local
• + Permeable, counts as pervious surface in many codes
• + Easy to install with a plate compactor

• − Loose DG tracks into the house and erodes in rain
• − Stabilizer adds $10 to $30 per ton
• − Needs edging or it spreads
• − Poor in freeze-thaw climates
• − Muddy when saturated

Compost

Fine, crumbly texture when fully decomposed. Dark brown to black color. Should smell earthy, not sour or ammonia-like. Screened compost has been filtered to remove large uncomposted pieces. Mushroom compost is a byproduct of mushroom farming and is particularly nutrient-rich.

Decomposed Granite

Decomposed granite is a mix of sand-sized particles and small granite chips, usually 1/4 inch minus, sometimes 3/8 inch minus. Colors run gold, tan, buff, gray, brown, and rose depending on the quarry. Gold and tan are the standard California and Arizona look. Sold loose, or stabilized with a binder that is mixed in dry or applied as a liquid.