What mulch depth is generally recommended for landscape beds and around trees, and how far should mulch extend from the trunk?

• A. 6–8 inches deep; extend 6 inches from trunk.
• B. 4–6 inches deep; extend 0 inches from trunk.
• C. 2–4 inches deep; extend 2–3 inches from trunk.
• D. 1–2 inches deep; extend up to trunk.

Answer: (C)

Mulch is best used in a moderate layer that protects roots and reduces weeds while still letting air and water reach the soil. A depth of 2–4 inches provides enough coverage to conserve moisture and insulate the soil without suffocating roots or creating overly moist conditions. Keeping mulch 2–3 inches away from the trunk prevents moisture buildup against the bark, which can lead to rot, disease, and pest problems, and helps ensure the root flare remains visible and healthy. The other options push the mulch too deep or place it too close to the trunk, increasing risk of decay, pests, and poor soil aeration.