How does mulching affect weed growth?

Mulching is an effective technique in gardening and landscaping that helps suppress weeds. When organic or inorganic materials are spread over the soil surface, they create a physical barrier that limits the sunlight reaching the soil. This lack of light is crucial for seed germination, as many weed seeds require sunlight to sprout.

Additionally, mulch can retain soil moisture, which benefits desired plants while simultaneously creating an environment that is less favorable for weeds to thrive. The presence of mulch can also alter soil temperatures, further inhibiting the growth of weed seeds.

Overall, the combination of light blockage, moisture retention, and temperature regulation makes mulching a valuable strategy for controlling weed populations in gardens and landscapes.