Mulch serves which of the following purposes?

• A. Preserves soil moisture
• B. Suppresses weed growth
• C. Adds organic matter to soil
• D. All of the above

Answer: (D)

Mulch serves several compatible roles in garden beds, primarily conserving moisture, reducing weed pressure, and improving soil health. It reduces water loss by shading the soil and moderating temperature, helping keep roots hydrated. It also suppresses weed growth by blocking light, making it harder for weed seeds to germinate and establish. Finally, organic mulches break down over time, adding organic matter that improves soil structure, nutrient availability, and microbial activity. Because mulch can provide all three benefits, the best choice is the one that lists preserving moisture, suppressing weeds, and adding organic matter. Note that inorganic mulches can still conserve moisture and reduce weeds but won’t add organic matter, while organic mulches contribute the soil-building benefit as they decompose.