Both decomposed granite and mulch cover bare ground, hold down weeds, and finish a yard, but they do almost opposite jobs over time. Mulch is organic, breaks down, and feeds the soil, so you top it up every year or two. Decomposed granite is crushed stone that packs into a firm, near-permanent surface but does nothing for the soil underneath. The right pick depends on whether you are dressing a planting bed or building a path people walk on.
What each one is
Decomposed granite (DG) is granite that has weathered down into a mix of small particles and fine dust. Spread and compacted, it locks together into a stable, natural-looking surface. It is a long-term ground cover for paths, patios, side yards, and seating areas. You can read more in our guide to landscaping with decomposed granite.
Bark mulch is shredded or chipped wood spread a few inches deep over soil. It is organic, so it slowly decomposes and returns nutrients to the ground while it sits there. That decomposition is the point in a garden bed, but it also means mulch is temporary by design. Our guide to landscaping with bark mulch covers the types and how to apply it.
Decomposed granite vs. mulch at a glance
| Factor | Decomposed granite | Bark mulch |
|---|---|---|
| Material | Crushed stone and fines | Organic wood |
| Lifespan | Many years; near-permanent once compacted | Breaks down; refresh every 1 to 2 years |
| Relative cost over time | Higher up front, low long term | Lower up front, repeating cost to top up |
| Weed suppression | Good, especially compacted over weed fabric | Good while thick; thins as it breaks down |
| Effect on soil | None; does not improve soil | Feeds soil and helps it hold moisture |
| Look | Firm, tidy, natural stone surface | Soft, woodland, garden look |
| Maintenance | Occasional raking and topping of fines | Refresh, and watch for it migrating |
| Walkability | Firm underfoot; good for paths and patios | Soft and loose; not a finished walking surface |
Where to use each
- Paths, patios, and seating areas: DG. It compacts firm, sheds water, and holds up to foot traffic in a way loose mulch never will.
- Planting beds and around shrubs: mulch. As it breaks down it feeds the soil and helps the ground stay damp between waterings, which is exactly what plants want.
- Side yards and utility areas: DG if you walk through often, mulch if it is mostly a low-cost bare-ground cover.
- Slopes: be careful with mulch, which floats and washes in heavy rain. DG packs down and stays put better, though steep grades may need edging or a different material.
- Around trees and foundation plantings: mulch, kept a few inches off trunks and stems.
A lot of yards use both. Mulch goes in the planting beds where soil health matters, and DG handles the paths and patios that need to be firm. For mulch specifically around plants, see rock around plants and garden beds, which walks through when stone makes sense near roots and when organic mulch is the better call.
The tradeoff that decides it
Mulch is cheaper to buy and improves your soil, but you pay again every year or two when it breaks down and thins out. DG costs more to install and gives nothing back to the soil, but once it is compacted it can sit for years with only light upkeep. If your priority is healthy planting beds, mulch wins. If your priority is a clean, firm surface you stop thinking about, DG wins.
How much you need
Mulch is usually applied about 2 to 3 inches deep, and a cubic yard covers roughly 100 square feet at 3 inches or about 160 square feet at 2 inches. DG is typically installed around 2 to 3 inches deep over a prepared base and compacted. These are rough numbers; the exact amount depends on your depth and area, so run your dimensions through our coverage calculator for a real figure before you order.
Frequently asked questions
Is decomposed granite better than mulch?
Neither is better overall; they do different jobs. Decomposed granite is the better choice for firm, long-lasting paths and patios. Mulch is the better choice for planting beds, because it breaks down and feeds the soil. Many yards use both.
Does decomposed granite improve the soil like mulch does?
No. DG is crushed stone and adds no nutrients. If your goal is healthier soil around plants, use organic bark mulch, which decomposes and returns nutrients to the ground.
How often do I have to replace mulch versus decomposed granite?
Mulch breaks down and usually needs a refresh every one to two years. Decomposed granite is near-permanent once compacted and only needs occasional raking and a light top-up of fines over many years.
Can I put decomposed granite in my planting beds?
You can, but it will not feed the soil and it can make replanting harder. For active planting beds, organic mulch is usually the better fit. Save DG for paths, patios, and areas you walk on.
Which one is cheaper?
Mulch is cheaper up front but you pay again to refresh it. Decomposed granite costs more to install but lasts for years, so it can be cheaper over the long run. Rates vary by distance and weight; request a quote for larger or far orders.
Get the materials
Shop decomposed granite for firm paths and patios, or bark mulch and topsoil for planting beds. Size your job with the coverage calculator, and for bulk or long-distance orders request a quote. We deliver nationwide from our California yards.