Which is a benefit of mulching in landscape beds?

• A. Increases soil salinity
• B. Conserves soil moisture
• C. Increases weed growth
• D. Reduces soil organic matter

Answer: (B)

Conserving soil moisture is the benefit provided by mulching in landscape beds. When you cover the soil with mulch, evaporation is reduced and the soil surface stays cooler, so water is lost more slowly and the root zone stays moist longer between watering or rainfall. This helps plants use water more efficiently and can improve drought tolerance. Mulch also shades weed seeds, further reducing water competition, which indirectly supports moisture retention. The other options don’t fit: mulching doesn’t increase soil salinity; it typically helps prevent salt buildup rather than promote it. It doesn’t increase weed growth—mulch suppresses weeds by blocking light. And organic mulches decompose and actually add organic matter to the soil over time, rather than reducing it.