How does mulching benefit plants in a greenhouse?

Mulching provides several beneficial effects for plants in a greenhouse, primarily by conserving soil moisture, reducing weeds, and moderating soil temperature. When a layer of mulch is applied to the soil surface, it helps to retain moisture by reducing evaporation. This is especially important in a greenhouse environment where temperature and humidity levels can fluctuate significantly.

Additionally, mulch acts as a barrier to light, which inhibits the growth of weeds. Fewer weeds means less competition for water and nutrients, allowing the desired plants to thrive. Furthermore, mulching contributes to temperature regulation; it keeps the soil warmer during cooler periods and cooler during hotter periods, creating a more stable environment for root systems.

While the other choices touch upon some aspects of plant care, they do not encompass the broad range of direct and indirect benefits provided by mulching as effectively as the correct answer does. By focusing on moisture retention, weed control, and temperature moderation, we gain a clearer understanding of why mulching is an essential practice in greenhouse management.