| Depth | Sq ft per cubic yard | 2 ft³ bags per 100 sq ft |
|---|---|---|
| 1 in | 324 | 5 |
| 2 in | 162 | 9 |
| 3 in | 108 | 13 |
| 4 in | 81 | 17 |
| 6 in | 54 | 25 |
How deep should mulch be?
2–3 inches for most beds, 3–4 inches to smother weeds, and keep it 2–3 inches away from trunks and stems. Topping up old mulch usually takes only 1 inch.