Mulch vs Rock: Cost, Maintenance & Which Is Better
Part of Landscaping & Aggregate
Quick answer
Mulch is cheaper to install — about $30–$60 per cubic yard versus $50–$120+ for landscape rock — feeds the soil as it breaks down, but needs topping up every year or two. Rock costs more up front and doesn't decompose, so it lasts for years, but it adds no nutrients, can heat up beds and is hard to remove. Mulch wins for garden beds; rock wins for permanent, low-traffic areas and drainage.
Both cover bare soil, suppress weeds and finish a landscape, but they behave very differently over time. Organic mulch is temporary and good for plants; rock is permanent and good for low-maintenance, decorative or drainage areas.
Side by side
| Factor | Mulch (organic) | Rock / stone |
|---|---|---|
| Cost | $30–$60/yd³ | $50–$120+/yd³ |
| Lifespan | 1–2 years (decomposes) | Many years (permanent) |
| Soil health | Feeds soil as it breaks down | Adds nothing |
| Weed control | Good (reapply) | Good with fabric beneath |
| Moisture | Retains, insulates roots | Drains, can dry/heat soil |
| Maintenance | Top up yearly | Occasional rake/refresh |
| Removal | Easy | Hard, labor-intensive |
When mulch wins
- Around plants, trees and garden beds that benefit from richer soil and moisture.
- When you want the lowest up-front cost.
- When you may rework the bed later — mulch is easy to remove or amend.
When rock wins
- Permanent areas: borders, dry creek beds, drainage zones, around downspouts.
- High-wind or sloped spots where mulch washes or blows away.
- Low-maintenance areas where you don't want to re-mulch every year.
Either way, you order by volume (cubic yards) from the bed area and depth — usually 2–3 inches. Size your beds first.
Estimate mulch by the yardMulch CalculatorCalculate how many cubic yards of bulk mulch or how many 2 ft³ bags you need to cover a garden bed.OpenFAQs
Is rock or mulch better around a house foundation?
Rock is often better right against the foundation — it doesn't hold moisture against the wall, doesn't attract insects, and won't need replacing. Use mulch farther out in planting beds where soil health and moisture matter.
Is mulch or rock cheaper?
Mulch is cheaper to buy and install — about $30–$60 per cubic yard versus $50–$120+ for rock. But mulch must be replaced every year or two, while rock is a one-time cost, so rock can be cheaper over many years.
Does rock kill plants or weeds?
Rock doesn't feed plants and can raise soil temperature and dryness, which stresses some plantings. It suppresses weeds best over landscape fabric, though seeds still blow in and root in the dust that collects between stones.
How much mulch or rock do I need?
Multiply the bed area by the depth (2–3 inches is typical) and convert to cubic yards. A 100 ft² bed at 3 inches needs about 0.9 cubic yard. Use the mulch calculator to size it for your beds.