Lava Rock vs Washed Gravel
Side-by-side comparison of Lava Rock and Washed Gravel to help you choose the right gravel for your project.
Overview
Lava rock is a lightweight, porous volcanic stone commonly used in landscaping. Its rough texture helps retain moisture while allowing airflow to plant roots.
Washed gravel consists of crushed or rounded stone that has been mechanically washed to remove all fines and dust. Without fines, the stones do not compact, allowing water to flow freely between them. Washed gravel is commonly used where drainage is the primary concern.
Common Uses
Lava Rock
- ✓ Landscaping
- ✓ Garden beds
- ✓ Decorative ground cover
Washed Gravel
- ✓ Drainage systems
- ✓ French drains
- ✓ Foundation backfill
- ✓ Septic systems
- ✓ Pipe bedding
Pros & Cons
Lava Rock
- + Very lightweight
- + Excellent moisture retention
- + Decorative appearance
- − Breaks down over time
- − Sharp edges
- − Can scatter easily
Washed Gravel
- + Excellent drainage
- + No dust or mud
- + Does not retain water
- + Clean, uniform appearance
- − Does not compact
- − Can shift under load
- − Requires edging or containment
Cost Comparison
| Measure | Lava Rock | Washed Gravel |
|---|---|---|
| Per ton | $90 – $150 | $25 – $45 |
| Per cubic yard | $110 – $180 | $30 – $60 |
Sizes & Colors
Lava Rock
Typically 3/4"–1.5" sizes. Red or black.
Washed Gravel
Typically available in 3/4" (#57), 1"–2", or mixed clean stone sizes. Color varies by source material but is usually gray, tan, or off-white.
Published February 11, 2026
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