Certified Professional Horticulturist (CPH) Practice Exam

What is the benefit of mulching in a garden?

1. It improves soil drainage

2. It suppresses weed growth

3. It enhances soil fertility

4. It provides a decorative finish

The correct answer is: It suppresses weed growth

Mulching offers several significant benefits, with one of the primary advantages being its ability to suppress weed growth. By covering the soil with a layer of mulch—whether organic (like wood chips, straw, or grass clippings) or inorganic (like gravel or landscape fabric)—you effectively block sunlight from reaching weed seeds. This reduction in light inhibits the germination and growth of unwanted plants, allowing garden plants to thrive without competition for nutrients and water. While other benefits such as improving soil drainage, enhancing soil fertility, and providing a decorative finish are notable, the specific action of weed suppression is particularly crucial for maintaining healthy garden beds. Weeds can not only compete for resources but may also harbor pests and diseases which could impact the overall health of your plants. Therefore, using mulch as a weed barrier can lead to a more productive and aesthetically pleasing garden environment.