What is the role of compost in landscaping?

Compost plays a vital role in landscaping primarily because it improves soil structure and nutrient content. When organic materials break down in compost, they create a rich, dark substance that enriches the soil when added. This process enhances the soil's texture, leading to better drainage and improved aeration, which are essential for healthy root development. Additionally, compost is packed with nutrients that are vital for plant growth, helping to sustain plants by supplying them with a slow-release source of nutrients. The microbial activity from compost also promotes a healthy ecosystem in the soil, which is crucial for nutrient uptake by plants.

While other choices mention aspects related to gardening, they do not encompass the primary benefits of compost. For instance, compost does not supply seeds, nor is it specifically designed to deter pests or increase air circulation, although improvements in soil structure as a result of compost can indirectly enhance air circulation. The core benefit lies in its ability to enrich and improve the soil, making option B the most accurate representation of compost's role in landscaping.